Why Go-To-Market Beats TAM Every Time - 6/11/2026

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📰 Today's Edition: Why Go-To-Market Beats TAM Every Time

The problem is TAM is useless unless you actually get customers.

I see this constantly with founders pitching Hustle Fund. They walk in with beautiful slides showing a $100 billion market. They've read the reports. They've done the math. They're convinced this proves their startup will succeed.

Then I ask them: "How much will it cost you to acquire a customer?"

Silence.

TAM tells you nothing about whether you can actually build a business. But first, what is TAM and how do people calculate it? 

How founders calculate TAM incorrectly

Most founders calculate TAM completely wrong.

They find a research report that says "the travel market is $100 billion" and slap that number into their pitch deck. Done. TAM complete. And now we can flap our hippocorn wings and fly to Bermuda.

Not quite. The right way is to use a bottoms-up approach. Let's say you run a marketplace for hippocorn hoverboard tours. Your cut is $10 per tour. You think you can reach 10 million people per year at scale. So your TAM is $10 times 10 million people, which equals $100 million.

Notice something critical here: that's your take, not total customer spend. Your TAM is what you actually capture, not the entire market spend.

But even calculating TAM correctly doesn't tell you if your business will work.

Why doesn't customer acquisition cost fit into your TAM?

In the example above, you only have $10 per customer to cover everything.

Your marketing costs need to fit into that $10. Your operational costs need to fit into that $10. Everything needs to squeeze into those margins.

In this hoverboard tour example, you need to acquire customers for basically free. Maybe you run ads on niche travel sites. Maybe you do SEO for activity keywords. But you have almost no budget to work with.

And repeat business? Forget about it. How many people take the same hoverboard tour twice? When will they take their next trip? Your repeat rate is essentially zero, which means you must break even on the first sale.

This is where most startups die. They have a TAM that looks amazing on paper but unit economics that are tough. 

Can a bigger TAM save you?

Let's change the example. Instead of hoverboard tours, you compete with hotels.com and offer hotel bookings.

Much bigger TAM, right? The hotel market absolutely dwarfs the hoverboard tour market.

But you still have the same problem.

If you make say $10 per night and people book an average of three nights, you make $30 per transaction. Your customer acquisition costs plus operational costs still need to fit into that $30.

Yes, you have more leeway here. Hotel bookings have better repeat rates than hoverboard tours. People book hotels multiple times per year.

But competing with hotels.com for customers is brutally expensive. You're fighting an established player with massive brand recognition and advertising budgets.

Even with a massive TAM, if the customer acquisition unit economics don’t work, the business doesn't work.

What happens when you flip the equation?

Let's create a different company: Hippo Grooming Co. There are 100,000 hippo pet owners worldwide. You offer a marketplace for hippo grooming services. You make $100 per groom. Hippos need grooming once per year.

The TAM is terrible. 100,000 people times $100 per groom equals $10 million. Any VC would laugh you out of the room with that TAM.

But look at your economics. You can spend up to $100 to acquire each hippo owner and serve them. The grooming is expensive, so your margin is solid.

And the magic is, you can acquire these customers cheap because nobody else wants to serve them. The market is too small for big players to care about.

So you build this tiny business with cheap customer acquisition and suddenly you have something valuable: an audience.

How do you expand beyond a small TAM?

Once you have that audience of hippo owners, you can upsell them on everything.

Hippo food. Hippo vet visits. Hippo playdates. Hippo sitting services.

For these upsells, you only pay operational costs. You already acquired the customer. Your customer acquisition cost is zero for the additional products.

Your customer lifetime value explodes.

That initial $10 million per year market? You can 10x or even 100x it just through upsells to your existing audience.

This is why TAM misleads you. The real TAM didn't reveal itself until later. The customer acquisition was cheap because the initial market was small. The market pull was fast because you could reinvest all your profits back into getting more customers.

What questions should you answer?

Stop obsessing over TAM calculations. Instead, answer these two questions:

1. How easy, fast, and cheap will it be to get your initial customer audience?

2. What can you upsell them on later?

These questions determine whether you can build a real business. The first tells you if your customer acquisition economics work. The second tells you if you have expansion revenue potential.

The hippo grooming example might sound ridiculous (I'm a hippocorn, so I have a bias). But the principle is sound: sometimes the best businesses come from markets that look too small at first glance.

What should you do right now?

Stop perfecting your TAM slide. Instead, run experiments on customer acquisition.

Test different channels. Measure your actual costs. Get real data on how much it costs to acquire customers and whether they stick around.

Then figure out your expansion strategy. What else can you sell to these customers?

Those answers will tell you way more about your business potential than any TAM calculation ever could.

Go-to-market strategy beats market size every single time. No exceptions.

Until next time,

Dunky, the "go-to-market" hippocorn

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