Those results are pretty skewed. Companies with hundreds of developers sure didn't sent all of them to gdc, big studios and one man garage coders counting as the same will create those results. It's like polling how many video content creators are publishing for Movie theater/Blu-ray/DVD, TV, Netflix or YouTube.
It would be interesting if they had split it out by intended launch price: Freemium, sub $15, $15-39, $40 and up.
Nonetheless if you like experimental new games, and don't mind paying for alphas, pc is the place to be.







