The challenge
A doctor-led weight-management subscription sold through more than one consumer brand. Customers start an online health quiz, finish it, then pay for a first consultation and subscribe. When I took the account over in January 2026, fewer than one in five completed quizzes became a paying subscriber.
Results
Weekly spend stayed within 5% of January, so the gain came from efficiency, not budget. The biggest move was at the bottom of the funnel: completed quizzes turning into paying subscribers went from 19.2% to 33.7%.
Month 3 cost per subscriber rose slightly because I deliberately funded new prospecting and Demand Gen tests. Subscriber volume held at about three times the month 1 rate while building future demand.
Months 2–3 averages vs month 1. Month 1 = weeks 1–5, month 2 = weeks 6–9, month 3 = weeks 10–13. Results are shown only as indexes, ratios and percentages; no spend, cost or volume figures are disclosed. Meta is described structurally only, and platform-reported Meta purchases are excluded.
The insight
Halving the Google account gave Smart Bidding enough conversions per campaign to learn, and that moved results more than any single bid or creative change. Bidding to quiz completions supplied several times the volume of purchases while still predicting revenue.
In a regulated category, first-party CRM audiences and plain, evidence-led copy do the heavy lifting, and the billing system, not the ad platform, decides where budget goes. By mid-April the challenger brand’s weekly cost per subscriber was running close to 90% below month 1.
