When I can't handle it anymore, there's a number of things I can do. 1) Make the emails more random - if I only send half the emails, it stands to reason that

When I can't handle it anymore, there's a number of things I can do. 1) Make the emails more random - if I only send half the emails, it stands to reason that I'll only get half the responses! 2) Stop sending them! There are other ways to gather feedback that may work better later. I haven't spent too long worrying about this, though. It'll be a good problem to have.