Comment by Folcon

Honestly I'm not sure, but I suspect it's because for Gabe, Valve is his iterated prisoners dilemma

He's got to take care of it or no more yachts

Though part of it just might be helpful knows and respects hit market, at least well enough to understand them, I vaguely recall he left Microsoft to start a game company after seeing how much people fell head over heels with games and thinking there was value there