About the only problem I see with mixing DJ-ing up with live playing is, if you DJ for any significant time, or perhaps the best received music you play is DJ tracks, what is to stop them looking at a DJ (who will happily undercut you) for their next gig?

The more you DJ, the more you ARE a DJ. And now, you have to compete not only against other OMB's and musicians in your area, but you have in one stroke added all the DJ's in your area as potential competition, too.