Yes, this is because of transmogrification. I don't know if a single feature yet introduced has managed to alter my play habits as much as this one. I search obsessively for gloves, boots, belts, capes to match whatever current set I'm trying to build. (At the moment, I'm vacillating between season 1 and tier 4). I even did some Arenas and RBGs in order to grind up a Cataclysmic Gladiator's Greatsword faster, not to use in PvP, but because I wanted to use it for mogging. Yes, I did PvP because I wanted to look pretty.
So now for you. Have you found yourself doing something you never would have, farming a drop, running instances, PvPing, maybe even raiding -- just for the 'mog?
World of Warcraft: Cataclysm has destroyed Azeroth as we know it; nothing is the same! In WoW Insider's Guide to Cataclysm, you can find out everything you need to know about WoW's third expansion, from leveling up a new goblin or worgen to breaking news and strategies on endgame play.