You know you should be spending more time learning new tricks that you know would make your code more efficient, but at the end of a 50 hour week just keeping up with your contracts, it's hard to justify ignoring your family/wife/investments/home-maintenance/etc/etc for something you have no urgent and immeditae need for. The purists will label you un-committed, un-professional, but you don't mind too much 'cause you have a life and a full business slate. Sometimes you gotta choose.