Sarge, I think what you're doing is really cool! And I'm telling you, with that many hits, the copyright owners to the music are going to take notice sooner rather than later anyway. You don't have to be making money for it to be illegal. Get yourself one CD of royalty-free music, change it out, and re-upload the videos. Then monetize the hell out of them and watch the very tiny bits of money trickle in.