This isn't exactly true, it's relatively common to see HN-user created games on the front-page. I think you're engaging in typical-mind; while this community is a space for nerds, not everyone here is interested in video games. The shared interest here is for "hacking", computer science, and computer software. I wouldn't even say the forum is necessarily business oriented, despite the association with Y-Combinator. It's simply that, because of the incentives, there is a lot of interesting software and research that comes from the private sector.