In comparison, I haven't had as many requests due to the nature of the thread that you made, but I've whitelisted 0 currently. Although, I haven't been actively reviewing it every day as I decided it would probably be better to add a gap to see how serious the user is, I did catch up with a few requests, and most never got back to me at all.
When I ask a follow-up question, I usually hear nothing again. I'm still trying a bit what works best.
as theymos says most users that hit the fee are for valid reasons, and in my mind its up to them to convince me.
They often ask me what to do to convince me. If I answer that, it would be far too easy.