Orange Box probably sold nearly as much as WoW, but it won't show up because it's on Steam.
I bought Orange Box, Company of Heroes, Deus Ex, COD4, and Garry's Mod (the $10 version) last year on Steam, none of that shows up here though.
So there's plenty of factors, and PC gaming is certainly not dead.
LEFT4DEAD411.COM
Bet with disolitude: Left4Dead will have a higher Metacritic rating than Project Origin, 3 months after the second game's release. (hasn't been 3 months but it looks like I won :-p )