pretty nice list of instructors there coach.. what kind of drumming do you do? (studio, session, gig, band, etc)
As for the sliding pay scale, I disagree with it as well. Where do you draw the line from beginner, intermediate, and advanced? This may lead to a lot of potential problems and some of your students may want to know why they are paying more or less than anyone else. To resolve this I think it'd be best to charge a flat rate for everyone. If a beginner started off with you and paid less and then progressed in skill with you would you then charge more? That just doesn't make sense.