It's been a few years since I looked, so maybe it's been raised since, but last I saw the 6 month subscription worked out to about $13.00 a month, and if that price still holds up I'd imagine an annual pass will be similar or less, maybe closer to $150.galdon2004 said:15 dollars a month, for 12 months comes out to $180. If we assume Diablo 3 will be 60 bucks like most games are nowadays, you could buy 3 Diablo 3 games for that.
That aside, what's your point? Obviously it's not going to be cheaper than just buying Diablo 3, but if you're likely to play WoW at least semi-regularly for the next year anyways, it would be a pretty sweet deal.