Most affiliate programs die not because they lack partners, but because the commission structure bleeds margin faster than it drives revenue. You pick a percentage—usually 20–30%—and watch cash flow compress. Six months later, you've paid $40k to partners who sent customers that brought you $60k in ARR. The math looked good on a napkin. It felt worse in the bank account. The problem isn't that commissions are too high. It's that you picked the wrong structure for your business model, then locked yourself into tracking payouts in a spreadsheet that no partner trusts and your finance team can't reconcile. Commission models live on a spectrum from "pay per action" (tight margin control, complex tracking) to "percentage of revenue" (simple payout math, unlimited upside exposure). Each changes what your partners actually optimize for—and how much cash you'll hand them by year-end. The three structures: where margin protection lives CPA (Cost Per Acquisition) You set a fixed dollar amount per qualified lead, trial signup, or paying customer. A SaaS company might pay $150 per trial signup that converts to a paid account, or $25 per qualified demo request. A services firm might pay $500 per referred client that signs a contract. Margin protection: Tight. You know the exact cost per acquisition upfront. If your CAC budget is $1,200 per new customer and you pay $150 per converted trial, you can afford eight referral sources for the same customer. Partner incentive: Quality over quantity. Affiliates earn the same whether they send 100 warm leads or 1,000 cold spam links. They optimize for conversion, not volume. This drives relevant traffic—but only if you define "qualified" clearly. A demo request from a startup's founder lands differently than one from an admin at a 50-person company. Payout frequency: Usually monthly, after you verify the lead converted. This creates a 30–60 day lag between partner action and payout, which strains cash flow for lean partners and requires manual reconciliation if you're using spreadsheets. When it works: High-ticket B2B services, SaaS with clear conversion gates (trial → paid), affiliate networks where partners specialize in lead quality. Best for companies that already know their CAC targets and can stomach partner acquisition as a predictable cost line. When it breaks: Low-price consumer products, subscription models where the first transaction isn't the revenue driver (upsells matter more), and teams without engineering to automate lead verification. Also painful for partners: if your conversion rate is 3%, they have to send 1,000 leads to earn $3,750 at $25 per signup. CPL (Cost Per Lead) You pay a fixed amount per lead submitted, regardless of whether it converts. A legal services firm pays $75 per qualified prospect. A B2B software company pays $200 per identified buyer in their target industry. Margin protection: Moderate, but inverted. You pay upfront for effort, not outcome. This sounds worse than CPA, but it lets you scale faster—partners don't wait for conversion to get paid, so they move volume. Partner incentive: Volume. Affiliates earn for effort, not results. They optimize for lead submission speed, not fit. You get more qualified leads faster, but you also get more tire-kickers. The trade-off is real: a legal referral partner sends 50 qualified prospects, and 8 become clients. That's a 16% conversion rate, good enough to justify the CPL spend. But only if you define "qualified" narrowly enough that spam isn't worth the affiliate's time. Payout frequency: Weekly or bi-weekly (since leads are easy to verify). This front-loads cash flow to partners, which keeps them engaged, but accelerates your payout schedule. If you're paying $200 per lead and partners send 20 leads per week, you're spending $4,000 weekly on affiliate payouts—and you won't know lead quality for 30 days. When it works: B2B services with long sales cycles (real estate, consulting, legal), SaaS with a qualify-first model, businesses with enough sales capacity to convert warm leads into customers. Works well when you have existing benchmarks: "Our legal team converts 15% of qualified CPL leads, so $200 per lead × 15% = $30 CAC. We can afford that." When it breaks: Low-touch consumer products, attribution-light channels (display ads, content), and teams without the sales ops chops to track lead quality. Also risky if your conversion rate is below 10%: partners can game the lead definition, volume explodes, and you're paying for dead weight. Revenue Share (or CPA with lifetime value) You pay partners a percentage of revenue from customers they refer. Typically 10–30% of recurring revenue (for SaaS) or 15–25% of total contract value (for services). Some structures include a monthly cut (5% of that customer's MRR forever) or a one-time cut (20% of first-year contract value). Margin protection: Weak upfront, strong long-term. You pay nothing until the customer pays, which protects your cash. But if you're spl