FloridaHoudini:
Generally doesn't happen with monthly paying stuff since you have to have an active subscription to enable stuff. Presumably even with the buy it once thing, its still checking to see that your CD key is valid, so I doubt that will happen.
For instance, you don't see much use for a cracked version of WoW do you? You still have to have a valid paid up account to play WoW, so all the crack does is get you the stuff on the retail cd, which can't be used.
Especially since blizzard shut down the alternative servers.
Note: I own WoW but havne't opened it, its too much of a time sink.