For $20? If I had no other choice, and I felt the quality of the project was really important to me, and there was a possibility of making a little cash off of the project, then yes.
If it was just for kicks, or non-profit, I'd probably only be willing to spend 5 or 10.
I can't make them myself, so yeah.
Similarly, if someone asked me for music for their non-profit, just for kicks game, I couldn't possibly suggest charging them for the work. I wouldn't turn money away, though.