I hate it when users leave one of my fellowships because I don't know why. I mean if it's just because they don't like it, or something like that - that is fine. But lets say if it's because we don't do this, or we need to do that - things like that helps.

For example, someone not too long ago left one of my fellowships but was nice enough to tell me why. It was something I could fix right away, and was able to re-invite him back.

So I think to have a box for a "reason you are leaving this fellowship" when a person leaves is a good idea, of course they can always leave it empty if they want.