The Part Time Druid posted a bit of an existential question -- "Why do we WoW?" It was followed up over on the Altoholic. And while their musings on the motivations for gaming are notable, I'm happy they avoided questions around that horrible WoW-addiction issue. I'm not much of the navel-gazing type, so I wasn't concerned about why I play WoW, in and of itself. (Presumably, I get something out of it, so fair enough.)
But, with pre-expansion blues (and excitement) crashing down on our heads -- why are we playing right now? Our gear's about to go obsolete (and we're about to put on our green-quality clown-suits), our level cap's about to go up 10 levels, and the whole world as we know it is going to be radically different! Oh, yeah, and those guys are going to be around, stealing our tanking spots and doing Elune knows what else! (Anyone else notice they're the first class to have two words as part of their name?)
For me? Nothing special about the pre-expansion time period. I play the same reason I always do. I play with my girlfriend, I play with my friends. I play in the Arena. In a year, what I've done now might not matter to what I'm doing then. But what I'm doing now matters now -- and for now, I'm having fun.