E-commerce & DTC Brands · Scenario 33

Supplements Subscription

Every channel looks profitable on first-order ROAS — until you count what it costs to acquire a customer who churns in month two. We model true LTV-to-CAC and payback, and fund only what pays back.

Method · Unit-economics modelling

The situation

A supplements brand scales whatever channel shows the best day-one return on ad spend, but first-order ROAS is a trap: some channels buy cheap subscribers who cancel after one shipment, while others cost more upfront but deliver loyal, high-LTV customers. Acquisition cost has climbed 40–60% industry-wide, so getting this wrong is now fatal.

Without measuring lifetime value against acquisition cost — and how long each channel takes to pay back — the brand keeps over-investing in cheap, churny growth and starving the channels that actually compound.

Day-1 ROAS
the misleading metric
CAC +40-60%
industry-wide
Churny growth
over-funded
No payback view
by channel

Where we dig for the truth

We measure lifetime value against acquisition cost by channel and cohort, and how many months each takes to pay back, so spend follows real profit.

Ad spend & CAC by channelSubscription & churn dataCohort revenue curvesContribution marginRefunds & cancellationsFirst-order vs repeat mix
LTV-to-CAC ratio by acquisition channelLifetime value earned per dollar of acquisition cost0x1x3x4x6x0.9xDiscount affiliates1.8xPaid social2.6xSearch3.4xInfluencer4.8xReferral

Discount affiliates lose money once churn is counted (below 1.0x), while referral and influencer compound. First-order ROAS hid all of this.

Our approach — LTV:CAC & Payback-Period Optimization

We build cohort lifetime-value curves and compare them to fully-loaded acquisition cost per channel, then compute the payback period — the months until a customer becomes profitable. Spend shifts to channels above a healthy LTV:CAC with acceptable payback, and away from cheap, high-churn sources.

Subscription and retention levers — onboarding, replenishment, win-back — lift LTV across the board, improving every channel’s ratio and shortening payback so the brand can scale safely.

From day-1 ROAS to true payback1Build cohort LTVTrace revenue and churnfor each cohort overtime.2Load the CACAttribute fully-loadedacquisition cost bychannel.3Compute paybackFind LTV:CAC andmonths-to-payback perchannel.4Fund what paysScale healthy channels;cut the churny ones.
Blended payback period by monthMonths to recover acquisition cost, after re-allocation0mo2mo4mo6mo8moM1M2M3M4M5M6

Re-allocating toward high-LTV channels and lifting retention nearly halves the blended payback period — the brand recovers its acquisition cost in months, not seasons.

What changes

Same budget, allocated by true unit economics. Representative for a DTC supplements brand.

Representative 90-day movementBlended LTV:CAC1.6x3.1x▲ +94%Payback period7.2 mo3.6 mo▼ -50%90-day churn41%26%▼ -15 ptsContribution profit$210k$340k▲ +62%
Where the profit comes from+$130kcontribution profitShift to high-LTV channels44%Lower churn, higher LTV34%Cut money-losing channels22%
Why this is not "social media management"
We didn't chase the channel with the best day-one ROAS — that is how DTC brands scale themselves broke. We modelled lifetime value, acquisition cost and payback, and funded only what compounds. Unit economics is the whole game.

Frequently asked questions

How do you scale a DTC brand profitably?
We build cohort lifetime-value curves and compare them to fully-loaded acquisition cost by channel, then compute the payback period. Spend shifts to channels with healthy LTV:CAC and acceptable payback, away from cheap sources that buy customers who churn.
What are LTV:CAC and payback period?
LTV:CAC is lifetime value divided by customer acquisition cost — above about 3x is healthy. Payback period is how many months until a customer's contribution recovers their acquisition cost. Together they tell you which growth is real.
Why isn't first-order ROAS enough?
Day-one ROAS hides churn — a channel can look great while buying customers who cancel after one order. Only LTV:CAC and payback reveal what actually compounds. Book a marketing audit.

Want this run on your numbers?

Send your channel spend and subscription data and we’ll model your true LTV:CAC and payback.

Book a marketing audit
Back to E-commerce & DTC Brands