From Ars Technica.

a look at some analysis form NPD on recent computer sales should make Apple's point of view crystal clear. For the month of June, slightly more than 9 out of every 10 dollars spent on a computer over $1,000 went to Apple.

So, while only one in ten computers sold in the USA were Macs, most of the money went Apple's way.

Seems like good business to me.