Valve is also the only company out of these big gaming companies who do lot of Open Source (working on it and funding other projects) and care about Linux. It maybe coincidental, but these care and goals align with my personal interests. No other company in the gaming industry does that to this extend, plus its an open platform. And being a private company brings also lot of freedom to not listen to shareholders.

The only thing is, that Steam itself is not Open Source… and the uncertainty what will happen if one day Gabe will no longer control…