I am far more liberal in saying "no" now than I was previously. Typically when a user comes around asking for X, Y and Z, I'll ask them "do you want this enough to do something about it?" - most of the time the answer is no.
This is usually followed by something I see a lot in the open source community (but I don't entertain _at all_ as an edu source developer), some variation of "this is a deal breaker for me." or "but pwease this is the only thing I am missing!"
Ultimately I write software for myself, not for anyone else. I allow individuals to use it for personal use and to look at the source code to learn from it. That's it.
This year I started selling commercial use licenses to fill the gap for people who wanted to be able to use my edu source software at work, and my approach is largely the same; I am allowing people to use the software under certain conditions and that's it.
I'm not selling feature development, I'm not selling support, I'm not selling any kind of prioritization.
I work on the things that I want to work on, sometimes those things include ideas pitched by others that excite me, sometimes those ideas come from people who pay for a license or sponsor, but ultimately I always work on what I want to work on, just like I did when I was the only person using my software.