I should point out that my argument only applies to games written for computers, not game consoles. The economics of the console market are very different, primarily because the console manufacturers maintain a strict editorial control over what games can be published. As a result, the distribution chain for console-based software is far more consistent in quality. On the other hand, there's far less opportunity for innovation in the console market, and this is only partly explained by the strong 'parental' influence of the console manufacturers. Because consoles don't have keyboards, console games are extremely limited in the kinds of social interaction that they can support, which means that console-based games tend to be focused around kicking, jumping, hitting, running, and other brute force physical activities. This in turn limits the console market to a fairly narrow demographic, one that isn't interested in complex social interaction. Similarly, because consoles don't have hard drives, they are limited to games which are mostly "stateless", meaning that the player can only affect a small number of selected variables in the game environment.