call me old fashioned but when i pay good money for a game i expect to be able to play that game as much as i want, for as long as i want. that is why i don't think i will get into this world of warcraft (and i highly enjoyed warcraft II and III as well as expansions, and still play them), as much fun as it sounds i don't think it is worth about half the price i pay for broadband each month.
even if they priced the game more than usual, say $150, for a "permanent" subscription i might be tempted, but it just looks like a bit of a rip off to me. for example i have CS:S, purchased it as soon it was released, infact. brilliant game, still play on lan, online with buddies and pub servers, still great fun after a few years, and will remain fun for some time. and yet i paid something like $60 (can't really remember).