How to Know Which Marketing Vendors Are Lying to You (And What to Do About It)

The Problem Every Founder Faces

You hire a Google Ads specialist. They send you a report. "Your campaign is crushing it," they say. Response rate is up. Click-through rate is strong. Quality score is excellent.

You hire a Facebook agency. New report. "Our targeting is dialed in." Cost per click is dropping. Impressions are climbing. Everything looks great on their dashboard.

You hire an SEO consultant. Another report. "Traffic is up 40%." Keyword rankings improved. Backlinks are growing. They're working hard.

And none of your business is growing.

Your revenue is flat. Your pipeline is flat. Your actual customer acquisition cost keeps climbing. But every vendor says they're doing a great job.

This isn't malicious. It's incentive structure.

Vendor Metrics vs. Business Metrics

Here's the core problem: vendors report on THEIR metrics. You need to know YOUR metrics.

Vendor metrics are not business metrics. They're correlated. Sometimes. But they're not the same thing.

The vendor looks great on their dashboard. Your bank account tells a different story.

This happens because:

• Not every click becomes a customer
• Not every customer generates profit
• There are hidden costs the platform doesn't show you
• There's inefficiency in your sales process
• Some channels cannibalize others

Google doesn't care about your CAC. Facebook doesn't care about your profit. They only care about their metrics. And they're incentivized to make their metrics look good.

Your job is to calculate YOUR numbers and compare them to what the vendor claims. That's the only honest comparison.

How Vendors Hide Bad Performance (It's Legal)

Vendors aren't necessarily lying. They're just showing you the numbers they control.

The Attribution Game

Most vendors use "last-click attribution." That means: whoever touched the customer last gets 100% credit.

Your customer saw a Google ad. Came back. Saw a Facebook ad. Came back. Saw your SEO landing page. Then converted.

The SEO vendor claims 100% credit. Google claims it. Facebook claims it. Everyone is "winning" in their own report.

The math doesn't work. But the reports look great.

The Channel Siloing Problem

Every vendor controls their own channel. Google reports on Google. Facebook reports on Facebook. None of them see the full picture.

They can't answer: "How many customers did GOOGLE bring, but FACEBOOK convinced them to buy?" That's your job to figure out.

The Conversion Window Manipulation

A customer clicks your Google ad on day 1. Converts 90 days later. If the vendor uses a 7-day conversion window, they get no credit.

Most vendors extend the window to look better. A 90-day window makes them look great. A 7-day window makes them look worse.

Same customer. Same outcome. Different report. You need to define the window, not let them.

The Cost Hiding

The vendor shows you ad spend. They don't show you:

• Your internal labor cost to manage the campaign
• Your tools and software to track the campaign
• Your credit card processing fees
• Your customer support cost per new customer
• Your product delivery cost

Add all that up. Your true cost per customer is 5-10x higher than the vendor's "cost per click." And they're fine with that, because it's not on their report.

The Real Story: When Platforms Lie (By Omission)

I audited a $9M/year distribution company. Their Facebook vendor was doing "great."

The vendor's dashboard said cost per customer acquisition was $181.

The founder felt good. Facebook was cheap. Other channels were expensive. They dumped more budget into Facebook.

But their profit was shrinking.

So I calculated the real number.

I pulled in their:

• Ad spend (including the vendor's fees)
• Sales commissions on Facebook customers
• Customer support labor
• Product delivery and fulfillment costs
• Payment processing fees
• Credit card chargebacks (Facebook customers had a 23% chargeback rate)

When you add it all up? Their real CAC from Facebook was $2,800. Not $181.

The vendor wasn't lying. The platform report was accurate. But the report was incomplete. It didn't account for the full cost of acquiring a customer on that channel.

That's a 15x difference. That changes everything.

What We Found

Once we had the real numbers, the solution was obvious: reallocate budget away from Facebook, toward channels with a real CAC of $600-$800.

They found $161K/month in wasted spend just sitting there.

The vendor wasn't evil. The system wasn't broken. The founder just didn't have the right numbers to make the right decision.

The Magic Question That Exposes Every Bad Vendor

Stop asking your vendor: "How are we doing?"

Start asking them: "What is my fully loaded All-In CAC from your channel?"

This single question will separate vendors who actually care from vendors who just want to look good.

What Happens Next

Reaction 1: The Good Vendor

They'll ask clarifying questions. "Do you want to include labor? What about chargeback cost? How are you defining a customer?" They'll want to get it right.

Reaction 2: The Bad Vendor

They'll say: "That's not how attribution works" or "We don't have access to that data" or "You need to talk to your CFO."

Translation: "I don't want to answer that question because my channel might look bad."

Reaction 3: The Lying Vendor

They'll give you a number that sounds good. $400 CAC. Then you calculate it yourself and get $2,000. They'll disappear or get defensive.

The question forces the truth. Because either they can calculate it, or they can't. And if they can't, that's a problem.

The Vendor Scorecard

After you ask the magic question, you need to know what to do with the answer.

Here's how to score any vendor:

This removes emotion. No more "I feel like it's working." No more "But they're nice people." Just math.

Example

Your All-In CAC target is $1,000. You have three vendors:

• Google Ads vendor: $850 CAC = GREEN. Keep them.
• LinkedIn vendor: $1,050 CAC = YELLOW. Give them 30 days to get to $900.
• SEO vendor: $1,850 CAC (or won't calculate) = RED. Fire immediately.

This system is objective. It's fair. And it works.

How to Have the Conversation

Now you need to talk to your vendor. Here's the script.

The Setup

Send them an email. Keep it short. No accusations. Just facts.

"Hey [Vendor], I'm doing a quarterly review of all our marketing channels. I need to calculate the real CAC for each channel so I can make better budget decisions. Can you help me figure out the All-In CAC from your channel? I need to include ad spend, your fees, and any conversion-related costs on my end. What does your data show?"

If They Give You a Number

Take it. Cross-check it against your own data. If it matches (or is close), they're honest. If it doesn't match, ask them to walk you through their math.

Sometimes they made a calculation error. Sometimes you did. Sorting it out is the important part.

If They Avoid the Question

Push back once. Keep it friendly. "I need this number to allocate budget fairly. What would it take to get it?"

If they still avoid it, mark them as RED. And prepare to move on.

If They Get Defensive

They're scared. Either their number is bad, or they don't want to be held to a standard. Either way, you know what to do.

When to Fire vs. When to Fix

Not every bad vendor should be fired immediately. Sometimes they just need a clear target.

Fire Immediately If:

• They won't calculate CAC or provide data
• Their CAC is 20%+ above target and they show no improvement path
• You've asked them to focus on CAC and nothing changed in 60 days
• They're defensive or hostile about the conversation

Fix If:

• Their CAC is 10-20% above target but showing improvement
• They're willing to optimize toward CAC (not vanity metrics)
• You can identify specific changes that will improve the number
• They're communicative and want to get better

The key difference: willingness to be measured and improve.

The 30-Day Vendor Ultimatum

If you decide to fix instead of fire, set clear terms. Put it in writing.

"Over the next 30 days, I need your channel's CAC to reach [TARGET]. Your current number is [CURRENT]. That means we need to improve by [X]%. We'll review progress regularly. If we don't hit the target in 30 days, we'll need to part ways."

This does two things:

1. It tells them the number they need to hit
2. It signals you're serious

Most good vendors will either hit it or communicate early if it's not possible. Bad vendors will disappear or make excuses.

What Happens After You Fire a Vendor

Once you fire a bad vendor, something interesting happens.

Your cash flow improves.

Not immediately. But fast. Usually within 30-60 days.

Why?

Because you're no longer sending budget to a channel with bad unit economics. That money either goes to better channels or stays in your pocket.

Money talks. Math works. Reality wins.

This is why the CAC scorecard system works. It removes opinion. Your bad vendor wasn't bad because you "felt" it. They were bad because the math said they were.

And once they're gone, the money that was leaking stops leaking.

FAQ

Q: What if I can't calculate CAC? I don't have the data.

A: That's the real problem. You need to build the data foundation first. Use the calculator at the bottom of this page. It walks you through the math. Once you have a baseline CAC, every vendor conversation becomes possible.

Q: My vendor says CAC doesn't matter, only LTV matters.

A: They're half right. LTV does matter. But CAC matters first. You need to know if the unit economics work before you scale. A vendor who won't talk about CAC is hiding something.

Q: What if my target CAC is too low?

A: Maybe. But that's YOUR problem to solve, not the vendor's. If no vendor can hit your target, your business model might not support it at that channel. That's data. Use it.

Q: Should I fire all my bad vendors at once?

A: No. Fire the worst one first. See what happens. Usually your revenue either stays flat or goes up. That tells you something. Then evaluate the next vendor.

Q: What about long-term value? Some channels have a longer cycle.

A: Fair. Define a longer CAC window for those channels. But define it FIRST, before the vendor reports. Don't let them choose the window based on results.

Q: How do I know if a new vendor is better?

A: You ask them the same question: "What will your channel's CAC be in 90 days?" Get it in writing. Then measure against it. No vendor should be shocked by this question.

Related Reading

Want to go deeper? These articles dig into the systems behind vendor evaluation:

• The Fully Loaded All-In CAC. How to calculate your true customer acquisition cost including all hidden costs.
• The Revenue Leak Audit Process. Step-by-step framework for finding where money is leaking out.
• The Complete Marketing Attribution Guide. How to connect ad spend to actual revenue (not platform reports).
• Best Tools for Fractional CROs. The infrastructure you need to track vendors and build your own data foundation.