Heck yes that would be super sweet to spend bitcoin in WoW and many other MMOs. It's just another example of the proliferation and development of the almighty bitcoin market. This is the cool thing about bicoin is how it can open doors to a whole new world of commerce.
Actually, just look at Second Life and how folks will sometimes convert Second Life Linders to BTC because it's one of the few ways to do so through Paypal.
Do the people actually coonvert Linders to BTC? I did not know that.... It would be great to have them adopt BTC and not having to jump through the PayPal loop to do it tho...
I think Blizzard should accept BTC on a wager system for multiplayer games in Starcraft. {They already have a good ranking system} They could also apply a minimum max bet.. eg. $0.50 per game...
A ingame tipping system will also help.... At the end of each game, if the other player played fair and there were no "nasty" comments... you could choose to tip him/her. {That would help to reduce the "rage" and "tantrum" outbreaks after the game ends}