For me it seems simple: if I stop using a service, it's because it didn't provide value to me. Even if I click a link in a reminder email out of curiosity - th

For me it seems simple: if I stop using a service, it's because it didn't provide value to me. Even if I click a link in a reminder email out of curiosity - that doesn't change the fundamental problem. I'd be interested to see some numbers on the long-term effectiveness of such campaigns, instead of the short-term spike in return visits