you are correct, but not because of dual booting... (its an obvious given that most will prob install ubuntu on a window machine and it will become that), but because one might also go Apple because they want/must develop software for apple devices.
Thats my world.
Macbook Pro ( a truly beautiful machine), and run Windows on a Fusion VM.
Over the last year since I've been developing on the Mac (iPhone/iPad development) I've grown a new appreciation for their hardware and software. (Well, maybe not for Xcode.
)
And thats from a life long Windows Developer. And I've never been accused of being a fashion slave.
Wab