If I had the $15 per month to pay for a game rather than gas/food then I would. I played WoW since day 1 back in '04, but its just too repetitive anymore. The PvP system went down hill as soon as arena came out, and that was the biggest lost for me. But I stuck with the game till Cata came out and I just find it to be the same thing every expansion. Get to the level cap, get maxed out gear, and then start on your other characters. Thats about it.
If WoW was free to play, then I would definately start again. Until then, I'll stick with Brink, INS, and unfortunately LoL.... :/