Most affiliate setups like this typically pay for paying conversions, not just high engagement traffic or clicks. However, engagement still matters indirectly because it drives users down the funnel and improves conversion probability. Tracking patterns like referrals, session depth, and repeat visits helps reveal whether traffic is qualified or not. In that sense, engagement is a supporting signal, while conversions remain the core payout metric used. So optimizing content means balancing persuasive traffic with clear calls that lead to real signups.