Please charge more. My current (indy) project just selected the stock music for our project. I'm happy to pay $30 / piece. The site that we licensed our music from had pricing options as well. E.g. $30 for the full track, down to as low as $7 for a short loop or a stinger.

Also if you can make it easier to find what I'm looking for then I'll look first at your site rather than others. E.g. is the piece fast/slow tempo, instruments used, genre or style, etc.

Good luck.