Oh, don't agonize so much, dear. Does the music you play have value? I certainly suspect so. Do you make mistakes when you play? Big deal, so do geniuses.Try it and see--a cover charge or a CD. Nobody is forced to pay for it, after all.
And consider the other side--the music has value, some people depend on a concrete recognition of that in order to make a living keeping the music going, and that is a novel concept somewheres. I started booking small concerts locally, hiring performers whom I know are good, and try to pay them decently despite the small audiences. $10 Canadian is not a lot to pay for an evening or afternoon of high quality music. But a lot of the restaurants and bars around here are competing with "jam nights"--not because they support the music, but because its cheap entertainment for them to make a profit over.
If you don't need the money, why don't you try booking a show as a benefit or fundraiser for some worthy cause? You'll find out something about your (shudder to say it) market value, any way.
The music is worth it--that's why we do it!
Cheers
Bill C