Customer acquisition in ecommerce is the work of turning a stranger into a first time buyer at a cost that eventually pays back. The health of an acquisition engine shows up in four numbers. Blended CAC. New customer payback period. Blended MER. And the quality of the customer you actually acquired, not just how many of them landed.

Author: Tristram Dyer, CEO of Webtopia and Oaks Email Studio

A Friday afternoon dashboard

I was looking at a dashboard on Friday afternoon for a brand doing around $9M in revenue. Home goods, founder led, growing at maybe 40% year on year. The founder had messaged me the day before saying Meta was broken. ROAS had dropped from a 2.8x to a 1.9x over six weeks. Spend was the same. Creative was the same. The whole team was convinced Meta had changed something in the algorithm.

I'd already pulled the cohort data before we hopped on. Meta hadn't changed. What had changed was who they were acquiring. Six months ago, the average first time buyer was spending $95. Last month, the average first time buyer was spending $62, and 70% of them came in on a promo code. Same ads. Same audiences. Different customer. Same acquisition cost. Very different contribution margin per customer.

The reality is, the ad account wasn't the problem. The offer stack in front of it was. That's the kind of thing you only see if you look at acquisition as a customer quality problem, not a ROAS problem.

Acquisition gets harder at every stage

The acquisition problem at $500K revenue is that not enough people know you exist. The acquisition problem at $9M is completely different. Everyone who wants to know you exists probably already does. You've already worked through your cheapest pockets of demand. What you're left with is harder audiences, fatiguing creative, and rising CPMs. Same ad account. Different physics.

This is the moment I meet most founders. Somewhere between $5M and $20M, where the playbook that got them here is quietly running out of road. More spend doesn't help. More channels doesn't help. The instinct to "just add TikTok" is almost always wrong. What's needed is a cleaner view of what acquisition actually is, and what levers are real.

The four numbers you need, in this order

Before we talk about any channel, any agency, any creative brief, there are four numbers you should be able to pull up in under thirty seconds.

Blended CAC. Total marketing spend last month divided by new customers acquired last month. Every channel, every dollar, not just Meta.

New customer payback period. How many months of contribution margin does it take to recover that CAC. If your CAC is $50 and your contribution margin per first order is $20, that's roughly two and a half orders. So if your repeat rate at 90 days is 25%, you're looking at somewhere around 5 to 7 months of payback. Give or take.

Blended MER. Total revenue divided by total marketing spend. This is the number your bank account actually cares about. Platform ROAS tells you about Meta's maths. Blended MER tells you about your business.

Cohort LTV at 6 and 12 months. What does a customer from June actually end up spending with you by December. You can't optimise acquisition properly without this. You're just buying volume and hoping.

If any of these four are fuzzy, the conversation about channel strategy is premature. You're optimising in the dark.

Concentration beats diversification

Every founder I speak with has a guilt list. "We should be on TikTok. We should be on YouTube. We should be testing Amazon. We should be doing podcast." The instinct to reduce reliance on Meta is sensible. The usual execution of that instinct is a disaster.

It's like going to the gym when you're out of shape. You don't start by trying to do five different sports at once. You pick one or two things, you get strong, and then you add.

For most brands at $5M to $20M, the right mix looks roughly like this. Meta as primary, somewhere between 50% and 70% of paid spend. Google as secondary, covering search, shopping, and PMax combined. And then one third channel, tested properly, for at least two full quarters. Which one? Depends on your category. Pinterest for visually led brands. YouTube for high consideration purchase cycles. TikTok Shop for impulse and under $50 products. Pick one. Commit to it. Spreading $30K a month across five channels produces five thin reads and zero conviction.

Creative is the targeting layer now

Since Advantage+ became dominant on Meta, and since iOS 14 blew up signal granularity, the whole idea of targeting the right audience has basically collapsed. The platforms are now better than you at finding the right person. What they can't do is make the creative that actually converts that person.

Fundamentally, creative is now the targeting layer. That's the bit people miss. The brands winning at scale are producing maybe 30 to 60 new creatives a month, give or take. Not hero films. Not big shoots. Volume. Different angles. Different hooks. Different hands holding the product. Short, ugly, honest stuff that tests fast. The brands relying on three evergreen hero ads are operating on a 2021 playbook. It's not working anymore. The maths has shifted.

The landing page is half the ad account

A 20% improvement in landing page conversion rate is worth the same as a 20% improvement in CAC. Think about that for a second. Most brands put all their money into the ad creative and almost nothing into the experience someone lands on after they click.

The ad does the heavy lifting of attention. The landing page decides whether that attention becomes a sale. Dedicated landing pages that match the ad promise. Mobile first, always. Trust signals above the fold. One primary CTA. Reviews close to the buy button. This is basic stuff. Most brands still get it wrong.

Acquire the right customer, not just any customer

Here's the uncomfortable bit. Not all new customers are worth the same. The CAC you pay to acquire a single purchase discount buyer is very different from the CAC you pay to acquire someone who'll buy three times in 12 months. Same number on the dashboard. Completely different commercial outcome.

The brands with healthy acquisition engines track cohort quality, not just cohort size. Revenue per new customer at 90 days by acquisition channel. Repeat rate by cohort. Discount dependency by source. This is where acquisition stops being a Meta problem and becomes a full business problem. A channel that delivers cheap CAC and rubbish LTV isn't cheap. It's expensive, just measured properly. (The retention side of this is in the retention basics post I wrote alongside this one.)

Net net, you're not optimising for how many customers you acquire. You're optimising for how much contribution margin those customers will produce over a defined time window.

What good actually looks like

A $15M DTC brand with a healthy acquisition engine is usually hitting somewhere around these numbers. Blended MER between 2.5x and 3.5x. New customer CAC paying back in 4 to 6 months. Paid media producing maybe 40% to 60% of new customers, with the rest coming from organic, email and SMS, referral, and occasionally retail. Creative production somewhere around 20 to 40 new assets a month across static, video, and UGC.

None of those numbers are a hack. They're the result of clean measurement, concentrated channel focus, and a creative engine that produces real volume. Boring answer. True answer.

The bit nobody wants to hear

If your acquisition performance has slipped and nothing's changed on your end, it's probably not because the platforms got worse. It's because the brands you compete with got better. Paid media is a relative game. You're bidding on the same inventory they are. The creative that wins the auction is what decides who scales and who stalls.

Where to go next

Webtopia runs paid media, creative, and growth strategy as one function. We work with founder led DTC brands between $5M and $20M. If your acquisition engine is plateauing and you want someone to walk through the numbers with you and show you what's actually moving and what isn't, reply or book a call. Happy to have the conversation.