Ryan Gordon: Financial reasons, and FUD.First, the market is tiny, that's a given, and that's enough to drive most companies away by default.Second, those who make decisions don't really understand Linux, and their brief interactions with rabid Linux zealots don't help. I get cc'd on all sorts of crazy e-mails Linux users send to game companies. Frequently I hear game producers say that they don't want to think about Linux because of the tech support issues. Heaven forbid they have to respond to a flood of people who have swooped in and inconvenienced them by purchasing their product! Seriously, at this point, you can train your tech support to deal with Linux by saying, "We don't support that"... People are happy to have a Linux port at all, and Linux users tend to be tech-savvy at this point... by the time Linux users are the AOLers and grandmas of the world and need tech support, it shows that you've actually got a large enough market to make it worth it. It's a self-fulfilling prophecy.