Modern game development requires an awful lot of people. It's not so much that individual salaries are too high, but that there are too many individuals involved. If you ever watch the credits for a game, they've gotten so much longer than in decades past. Games are more complex, and have a lot more detailed content, and all that, so it's not that people are less productive, but still. The same thing happened in movies as well --- most movies with any sort of effects are going to have ten minutes of credits.