When it comes to the management staff, Apple typically hires people who are not technically savvy. They may have computer skills, but those skills are incidental when compared to people/retail skills.
People who are not technically savvy are the prime target for Apple's marketing- so bringing these computer novices into the company and educating them on how everything Mac (hardware, software, iPods, etc) works so smoothly together engenders a sense of loyalty about the brand and the product. Even with a pay raise, working for Microsoft is not very appealing to these folks. There are always exceptions, but my point is that Microsoft would do better to pick from the enormous pool of retail management that has not yet been indoctrinated.