League of Legends is also incomprehensibly huge. And Blizzard is nothing to scoff at.
*EDIT: Found the article an article from Newzoo. Looks like China alone is almost triples USA PC game sales.
http://www.newzoo.com/insights/us-and-china-take-half-of-113...
Why are consoles banned in China (2010): http://kotaku.com/5587577/why-are-consoles-banned-in-china
China lifts the ban (2013): http://kotaku.com/china-lifts-their-console-ban-but-theres-s...
Some big department stores even sold major consoles and games, including Friendship Stores[1] which are state run.
In other words, Valve holds all the cards in the majority of negotiations.
I guess there's Origin, but I've only ever bought Mass Effect 3 from them.
Good luck even finding PC games in a box in a retail store...
EDIT: Derp, completely spaced Blizzard... that's where most of the missing money must be going.
Really? The most popular retail PC games are easy to find at a variety of stores in the south-eastern US. I've seen them at WalMart, GameStop, Best Buy, Fry's Electronics, and MicroCenter.
Is anyone else under the impression this number is too low? I mean, sure, it's still impressive, but at this point I would honestly expect them to control 30-40% of the PC core games market at least. I'd find it easier to believe that the NewZoo estimate is inaccurate.