Industry benchmarks for Marketplace Platforms
Marketplaces should recover CAC in about 9 months, measured on net revenue rather than GMV. CAC runs $120 to $350 per active participant, and the supply side is usually more expensive to acquire but far more valuable to keep. Net take-rate revenue lands at $20 to $60 per month per active account at 65 to 78 percent margin after payment processing, trust and safety, and support, with monthly churn of 4 to 7 percent. At $220 CAC against $25.20 in monthly gross profit, payback is 8.7 months.
Liquidity is the retention lever, because participants churn when they stop getting matched, not when they get a better offer elsewhere. Repeat transaction rate within the first 30 days is the strongest predictor of long-term retention, so search quality, response time, and fill rate do more for LTV than any lifecycle email. Disintermediation is the second issue: transactions that start on-platform and settle off it look like churn but are really leakage, and payments plus escrow are the usual fix. Model supply and demand CAC separately, since a blended number hides which side is actually constraining growth.
Frequently asked questions
CAC Payback Estimator for Marketplace Platforms, answered.
Should marketplace ARPU be GMV or take rate?
Take rate. GMV is not your revenue, and using it inflates payback math by an order of magnitude. Model net revenue per active account per month.
Do I calculate CAC for buyers and sellers separately?
Yes. The two sides have different costs, different lifetimes, and different value. A blended CAC will hide the fact that one side is subsidizing the other.
How does disintermediation affect LTV?
It caps it. Users who move transactions off-platform still consume acquisition cost but stop generating revenue, so track the ratio of contacts to completed on-platform transactions as an early warning.