Partially because he is a hometown boy and more because he will be relatively cheap. I agree though I would rather have McGee although he is looking to get paid (!!!!) this off-season. Still depsite being a bit of a bonehead there is no denying his talent. Especially on the defensive and rebounding fronts.
McGee is exactly the sort of athletic Center I'd like to see playing alongside Monroe, and he could also clean up when Stuckey or Knight drive to the hole.