Most founders hit a wall somewhere between $2M and $10M where every time they try to scale ads, the same thing happens…
CAC spikes, ROAS drops, profit falls into a black hole.
So they pull back, return to baseline, and wake up in the middle of the night frustrated at the damn ceiling they keep bumping up against.
I’m here to show you how to avoid that.
Let’s start with the basics…
The Metric That’s Costing You Money
ROAS.
Probably the most common and well-known metric in DTC, yet it’s a terrible metric and ruining your margins if you’re following it without realizing how incomplete it is.
Here’s an example…
Let’s say you spend $100 on ads and generate a $100 sale. Most dashboards show that as 1:1, or a 100% ROAS.
But if your contribution margin (CM) is 50%, you’re only keeping $50 of that $100 sale. The other $50 goes to your variable costs needed to fulfill on the order.
In that case, your ROAS isn’t 100%…
It’s 50%
Without knowing this, you might keep pushing at scale thinking you’re breaking even on Day 1, when in reality it might be taking you months.
This is why I track CM-ROAS, or contribution margin adjusted return on ad spend (ROAS). Instead of dividing revenue by ad spend, you divide contribution margin dollars by ad spend.
Easy peasy.
And once you’ve got CM-ROAS dialed in, the next layer is what I call…
Acquisition Economics
Acquisition economics measures how efficiently you turn marketing dollars into revenue, and more specifically, contribution margin.
There are two parts to it…
1: Conversion efficiency. How well are you turning prospects into customers? This starts at the ad level, not the landing page. The ad captures attention and creates interest. The landing page converts that interest into a purchase. If those two things aren’t congruent, if the ad speaks to one specific problem and the page talks about something else entirely, your conversions will tank.
2: Economic efficiency. This measures the contribution margin generated by a customer during the initial purchase. Similar to AOV, EPC, EPV and a few others, so track it however you prefer that makes sense, just make sure you’re factoring in contribution margin.
The goal here is more customers who give you more contribution margin per purchase.
And as usual, they don’t work in isolation. You can have great conversion rates and terrible economics. You can have great economics and a broken conversion process. You need both running together, because they’re two sides of the same coin.
The Number You Actually Need: Your ACAC
Most founders have some vague sense of what they can afford to spend per customer. Maybe their agency told them. Maybe they did a quick break-even calculation. Maybe they’re guessing.
In most cases, they’re wrong – and it’s one of the biggest causes of “where the hell did our profit go?” syndrome.
The right number is your Allowable Customer Acquisition Cost (ACAC): the maximum you can spend to acquire one customer while still hitting profitability within your target timeframe.
The formula is simple.
ACAC = Contribution Margin per Customer (in your target timeframe) minus Overhead per Customer
Let’s say you want to break even within 90 days. In that 90-day window, a typical customer generates $200 in contribution margin. Your overhead costs, divided across your customer volume, work out to $100 per customer.
$200 CM minus $100 overhead equals $100 ACAC.
That’s the maximum you can spend to acquire a customer and still be profitable within 90 days. Spend more and you’re losing money on the timeline you’ve set. Spend less and you may be leaving volume on the table.
Now here’s the fun part…
Let’s say you know those numbers, and you want to scale without hurting your margins. In that case, you’d have four levers to pull:
1. Increase volume at the same spend. More customers means your fixed overhead gets spread across more orders. Overhead per customer drops. Your ACAC ceiling goes up.
2. Cut overhead. Same math in reverse. Reduce your fixed costs and your overhead per customer drops. That freed-up margin gets added directly to your ACAC. If overhead per customer goes from $100 to $50, your ACAC goes from $100 to $150. You can now spend 50% more per customer at the same profit level.
3. Improve your economics per transaction. Higher average order value, better contribution margin, stronger back-end offers. If your CM per customer in the first 90 days goes from $200 to $250, and you’ve also cut overhead to $50 per customer, your ACAC moves from $100 to $200. You’ve doubled what you can spend, at the same margin, without touching your ad account at all.
4. Extend your breakeven window. Most people never consider this. Say you’re currently working on a 90-day breakeven and your ACAC is $100. What if you extended to six months, using a line of credit (LOC) to float the difference? If customers generate an additional $100 in contribution margin between months three and six, your ACAC ceiling becomes $200 instead of $100. You lose 10% or so on the LOC, but gain hundreds or thousands of percent in return on invested capital. I’ll take that trade all damn day!
Fundamentally, that’s how you scale without hurting your margins.
I talk a lot about the 3 fundamental layers of economics, strategy and tactics.
What I just walked you through was the economic layer. From there, you’d formulate a strategy, and from that strategy, figure out what tactics were needed.
Where To Start
If you want to start building this out right now, here’s the sequence…
First, decide on a target breakeven timeframe.
Second, calculate how much you generate in contribution margin from each customer on average throughout that timeframe.
Third, calculate your overhead per customer. Take your total monthly fixed costs and divide by your customer volume.
Fourth, run the formula: CM per customer in that window minus overhead per customer. That’s your ACAC.
Now you have a number to work from, a foundation for every acquisition decision you make going forward, instead of whatever your dashboard happens to be showing you on a given day.
If you want help modeling this out across your whole business, including all five profit levers, grab The Scalable Profit Model at scaleadvisors.com/book or reach out and let me know you’d like to discuss working together.