Being a hardware seller primarily doesn’t mean Apple wants to saturate the marketplace either. Selling commodity hardware isn’t where the money is. Software isn’t exactly a winning proposition either. Both rely on huge numbers and razor thin margins that don’t exactly allow for innovation.
In typical Daring Fireball style, he breaks it down much better and in more detail than I can summarize, so take the time and read up on why Boot Camp isn’t going to change Apple’s business model.
