We see the same play almost everywhere. A tangible offer. A deadline. A list of benefits. Save $200 before Friday. Renew now to maintain access. Final hours: rates increase at midnight. The campaign hits its join-rate number on the dashboard. Then you follow that cohort to renewal and watch it come apart.
Every message a prospect picks up before they fill out the join form is training them. If you sell membership like a transaction, you get subscribers, not members. A subscriber is a buyer with a timer running. A member is someone who sees themselves in the story. Both will decide whether to keep paying. The reasons each one decides are totally different.
You can't message your way out of a system that taught people to judge you on transactions. Members behave the way you've trained them to. One campaign won't retrain two years of that behavior. The fix isn't a better save-the-membership email. The fix is one step upstream, before the join.