Honestly, PRC needs a couple things...
1. More promotion. As I am typing this Irish asked "what's PRC?"
in ThaSauce irc channel.
2. People need to choose sources that other's will enjoy remixing.
There was a period where people would choose random stuff and I just wasn't interested.
Since I became uninterested, moved on to other things, and forgot about PRC.
JH has had great success with JHCompo because of how much promotion he gives it. JH creates a facebook event for JHCompo, announces it on facebook, and even bugs me on IRC when its about to start.