I agree, I don't think it does. $50 feels like a lot even for a commercial-grade game, $60 feels like a fortune; gaming also has an enormous piracy problem (look up what happened to Paradox Interactive with the release of _Demigod_).

Gaming isn't really the same field as commercial software; a product is released once, and that's the end of it, as opposed to needing long-term support like a commercial product does. Put another way: after people buy Halo 3, they aren't likely to upgrade to Halo 3.11 for Workgroups.