This is a perfect example of how attaching money to a hobby is guaranteed to ruin it. Dealing with customers is a gigantic pain in the ass, it doesn't matter if it's a large product or some niche esoteric project.

I have the exact same issue regarding support with a simple app I have on the App Store, I can perfectly relate. Despite being a really simple app and extremely cheap, every once in a while I have to wake up to angry e-mails from disgruntled users.