I wasn't trying to bait an argument, I was being serious. There are games I want to play that are only developed for Windows.

I don't need to run Linux to develop or deploy for Linux, but I do need to run Windows to play those games. It is not irrational for me, then, to choose Windows as my host OS.

It's not irrational to have other preferences either, but that wasn't the claim the grandparent made -- that there were no rational reasons for someone to use Windows.