I didn't realize they had this much market share for computers over $1,000...

That's because according to NPD, in June, 91 percent of the market for computers that cost over $1000 belonged to Apple.

 

Sure, it helps that Apple only sells two computers under $1000—the white MacBook and Mac mini—so if you get a Mac, it's probably going to cost over a grand. In fact, the average selling price of a Mac is $1400. But, consider that Apple claimed just 66 percent of the $1000+ market in the first three months of 2008, and 88 percent in May of this year.

...

...

http://gizmodo.com/5321332/if-you-buy-a-computer-that-costs-over-1000-its-probably-a-mac