What surprises me most is not the numbers for Linux, but for OSX. Somehow everybody is under the impression that OSX sells so much better than Linux, but this is simply not true. Despite the fact that Macs are so popular (personal observation from daily life), the actual sales are not so much higher than sales on Linux. Also Apple has an already established position in the market, so the sales are not going to skyrocket all of the sudden, while Linux market share is growing right now. And that is why I fail to see why anyone would consider releasing a game on OSX and not on Linux. After all, they are both Unixes -- if you have a version for one, you are already half way there with the other.
I don't think people understand. Microsoft has fought tooth and nail to convince developers their platform should be the only platform to develop for. They have backed it up by pushing kick-backs (Money) to developers to not only develop solely for Windows but to also publicly crucify Open Source.
In using Windows, you become part of the problem. You inadvertently tell developers you want Windows only Software and Games. By buying and playing Games on Windows, you contribute to Microsoft's success on it's war with Linux, Open Source and Multi-platform.
DirectX, Basic, XNA, crippled OpenGL, back-channel funding, SCO; when is it going to sink in people? When it's too late?.
Some developers saying it took just a few days for them to port a game and fixing bugs means they're doing things right in the technical side, platform agnostic = future-proof. They also think is worthy not only because they earn money but because they gain freedom, any company not concerned about this will loose big opportunities. I'd say those are bright minds that will lead the way for others.
Just some comments on the article that I like. It's a pity that GOG won't listen to its passionate users and continues to fall into the Microsoft trap.