Nice initiative! I think the low rewards has nothing to do with art or music, but in general the same post authors gets the rewards, and the same dont get them. Steemit is all about networking, and trying to get (auto) voters from your network. Those who are very good networkers, participate in many of the ongoing projects at and around Steemit, are getting better rewards, at least that is what I think is happening. But again, nice initiative!