People Voluntarily choose to become models. They reap financial benefits with their attractiveness, some women become super-models.
They do, yes. But when the majority of females in the games industry are booth babes, that only reinforces sexist preconceptions. One need only look at the internet's response to Jade Raymond for an example of how semi-attractive women in the industry are generally treated. If you're a semi-attractive woman in this business, people will automatically assume that your primary role is to serve as eye-candy regardless of your actual career. Booth babes promote this mentality.