I posted a long explanation on blabber, where, incidentally, you can find me if you want to talk to an easy-on the eye slacker with an eye to the main chance (http://blabber.forums3.com/portal.php)
Basically, I decided that the skill involved wasn't useful enough to warrant the time and effort involved in learning it. More to the point, I stopped enjoying it.
OMG there's another message board? I took a nosy around, couldn't find the post but can see you've got a lot else on. I've done my share of MA hopping: karate, kungfu, taekwondo, ninjutsu, judo. Want to stick it out at least a couple of years before deciding. I probably enjoy my gym time more because any gains are almost entirely down to the work I put in and exercises I choose to do.