The classic thing is that "nobody uses Windows". The real thing of course is that many people contributing to various projects end up using some *nix setup. So

The classic thing is that "nobody uses Windows". The real thing of course is that many people contributing to various projects end up using some *nix setup. So despite Windows being a big part of many userbases, ultimately maintainers often don't even have a Windows machine, let alone the knowledge to deal with some Windows-specific issues or bugs. Though here it seems to be mostly a money thing ($629/year is a real amount of "pocket change").