You're right that the current Linux market is quite different from the market as a whole. But a great killer app like Steam could bring a lot of "normals" over

You're right that the current Linux market is quite different from the market as a whole. But a great killer app like Steam could bring a lot of "normals" over from other platforms and change that. It's basically a chicken and egg problem that needs some established company to make a big bet on Linux to initiate change. That's why I think it could pay off big time. If Valve could draw even a tiny fraction of Windows gamers over to Linux it could kickstart a huge migration away from Microsoft over the next several years, with Valve at the center.