I actually have different experience, I spend all my time on projects but see very few donations :) But thank you to all who donate to open source and other projects.
I once got an unsolicited donation that was larger than my lifetime earnings...
The sender didn't reply to messages.
I really wasn't sure what to do. And without a document saying it was a gift from the sender, I had to give half away as taxes, and then there was no possibility of returning it (I wouldn't be able to reclaim the taxes).
Yeah no such luck here ^_^ [1] But I like doing my projects so much that this is not discouraging me to continue. But it does motivate me more when I get donations.
So I only accept substantial donations if I'm very sure I'm going to be able to do a substantial amount of work on the project going forward.