I have the WoW credit card, and using it has a decent chance of sparking conversation if they know anything about it.
The response I hear the most when they explain to me why they don't play anymore is "The game started to go down hill with WotLK."
I don't understand this comment at all for a couple reasons:
(1) I loved WotLK, everything about it.
(2) WoW peaked with that expansion.
(3) I raided more in that expansion than I did in any pre/post expansion (I've played since vanilla beta) (I remember the preview for WoW on the WCIII CDs)
(4) I had more RL friends playing the game during that expansion than any pre/post xpac.