Keep in mind that this thread is far from representative of the hobby as a whole. ENWorld attracts far more GMs than it does players, and the players it does attract are the sorts that really get into the game and would go looking online for a forum to talk about it...
There's only one person I know in two games (one I run, one I play in) who is on ENWorld, and that's because I found him here.
That said, I would much rather play. I love coming up with characters and just the general fact that players have vastly more reward compared to the effort they put in to things. Yeah, I'm a lazy bastard. Unfortunately, I very rarely get to play. In fact, this game I'm in now is the first time I've had the opportunity to play in someone else's campaign in a couple years.
I wouldn't want to give up running games entirely, but if the opportunity arose where I'd get to play regularly for a while I'd totally take it and take a vacation from GMing.
On the Pirate Cat scale, I'd say I'm 2:8, although that's largely because of burnout... if I played more, I could see myself swinging down to a 4:6 or even 5:5.
Oh, and just to address the original question (why so many don't want to DM), I think it's pretty obvious. A DM has to be a rules lawyer, a mathematician, a psychologist, a sociologist, a writer, a teacher, well-prepared and on top of it all working with players is like herding cats.
A player just has to show up (and half the time the bastards can't do that right either).