1 fairly powerful computer, $1600
4 WoW accounts (battle chest) $160
4 monthly fees (after free months from recruit a friending myself) $60
Having people come up to me in the noobie areas while I test and say "WTF!"... priceless!
For everything else there's prepaid cards.


Seriously though, the cost isn't all that much. I would have the PC anyway, and would have bought Assassin's Creed and Crysis at $110 bucks this month instead of spending all my time on WoW. If I wasn't playing WoW in that time, I would be using my recently canceled Netflix subscription ($17 a month), going to see 1-2 more movies a month, ($16-$60 depending on how much I like the girl I take), and going out for a drinks or dinner instead of going out for PVP with my WoW buddies ($10-$50 depending on who/where/how thirsty).