I'm sure that Starcraft 2 is still a commercial success. It might not have made as much as WoW yet, but as expansions come out it will definitely is going to make a lot of money. I'm sure they'll also experiment with different monetization models like they are with Diablo 3.
Starcraft 2 is certainly a commercial success, but it will never, ever make as much money as WoW. WoW grosses more than SC2's total sales every five or six months.
I'm wondering if it's worth it though. I run WoW fine through Wine.
After how much trial & error?
I realize Linux users are not Windows users, but how well would WoW have sold if the installation was as painful as a Wine setup can be for Joe User? If the install-to-run experience is a pain in the arse, this is a barrier to adoption. In commercial terms, this has financial ramifications.