The only feedback I get is one of three things: 1. they end up becoming paid subscribers 2. they unsubscribe from the list and never hear from me again 3. don't

The only feedback I get is one of three things: 1. they end up becoming paid subscribers 2. they unsubscribe from the list and never hear from me again 3. don't bother to do either and just languish on my list and I email them manually whenever I feel like it I haven't done a lot of tweaking to determine if I'd get more conversions if I slowed down the pace of the up-sell emails though.