Let's face it, AMD, nVidia and Intel have >99% of the PC GPU market, and 100% of the Mac market. The drivers only change from one chip generation to the next, a

Let's face it, AMD, nVidia and Intel have >99% of the PC GPU market, and 100% of the Mac market. The drivers only change from one chip generation to the next, and the Mac has had chips from all recent generations from all 3 manufacturers. The total number of drivers is therefore identical. I really don't think there's much in it. See also: Silverlight's XNA.