I got my friends 10 day trial for the official Blizzard server. It was cool and all, but I was too cheap to pay to play it. I could easily support a WoW addiction, since I have nothing else to spend my money on, but I don't want to. I like being cheap and going on free private servers and stuff. Some of them are really good, with higher EXP and drop rates and all that jazz. I once ran my own server as well, but only for me and no one else.
So long story short, I played the cheap way a while back, but nowadays I don't wanna bother with it.