While selling a beat for $15.99 or even .99 cents seems low, if you look at it from the standpoint that you can get a full song with lyrics, melodies, hooks and music for .99 cents then the beat maker is really getting over.
Part of the discussion may be about perspective. If a beat maker has thousands of beats on their computer as you all often do, then maybe the thought is why not sell them for something instead of keeping them for nothing. The well of creativity only dries when we say so.
Before selling, licensing or giving away your music, ensure you have a music business contract in place. It's wise to have a music business plan as well, so you know exactly how to reinvest your money.
Music Industry Connection