Every channel decision you make flows from one number. Not ROAS. Not ACoS. Not c
By Adam Weiler · October 29, 2026 · Curated by George's Blog
Every channel decision you make flows from one number.
Not ROAS. Not ACoS. Not cost per click.
Lifetime value.
If you don't know your LTV, you're guessing — on Meta, on Amazon, on TikTok, everywhere.
Here's why it matters so much:
Say your customer acquisition cost is $50. Sounds aggressive. Might even feel scary.
But if your average order value is $85 and your customer stays for a year, buying every month or two — that $50 CAC starts to look like a bargain.
The 3:1 LTV to CAC ratio is the baseline most brands shoot for.
Get above that and you have something. Stay below it and you're funding a business that doesn't work yet.
Here's the simple framework:
1️⃣ Average order value x average number of orders over 12 months = LTV baseline
2️⃣ Subtract your COGS and fulfillment costs = Gross margin LTV
3️⃣ Divide by your CAC = your ratio
If that ratio is above 3, you have room to get aggressive on spend.
If it's below 2, you've got a unit economics problem that no amount of ad optimization will fix.
Why does this matter for Amazon specifically?
Because Amazon PPC can look expensive upfront — especially in the first 60-90 days when you're building ranking.
But if a customer acquired on Amazon at a high initial CAC comes back twice more over the next year? The math flips completely.
The brands that dominate their Amazon category aren't just optimizing for day-one ROAS.
They know their LTV. They know what they can afford to spend to acquire a customer. And they deploy that with confidence while everyone else pulls back.
Who can spend the most to acquire a customer wins the category. LTV tells you what that number is.
Do you know your LTV well enough to use it as a spending ceiling — or is it just a number in a spreadsheet you haven't looked at in months?