I have invested the time in setting up a Windows VM w/ PCI passthrough in order to play some games with friends. So I am not a hardline free software user or unwilling to use Windows for playing games.
But when a distributor and developer is openly hostile to the platform even as it's gaining traction among other developers (Valve, Google, etc), I am certainly willing to not buy their games anymore as a somewhat political stance. There are plenty of games that run on Linux for me to spend my time and money on.