The key is not to build the comprehensive list of games. You can always take the Linux games and work through them. But the idea is to highlight that there is a real Fedora user who plays this game. And it is possible to talk about it. Whether you want a technical help or just to discuss the gameplay, you can come to the Games SIG and feel at home.
This provides the exposure to Fedora Games SIG, which may eventually bring more initiatives and more development.