In the nineties, Apple kept insane profit margins on their products while dozens of manufacturers created inexpensive commodity PCs running Windows. There was a margin war on the PC side, and PCs became noticeably cheaper (despite paying hefty licensing fees to Microsoft), and that price difference, combined with Microsoft closing some of the usability gap with the Mac, is what lead to the dominance of Wintel machines. In the nineties, Macs simply cost more. You could argue that Macs were cheaper based on TOC or employee efficiency, but in the quantifiable terms that bean counters understand, the Mac was a lot more expensive and didn’t do noticeably more, especially once Adobe jumped ship and become cross-platform.
That’s not where things are now, however. For typical consumers – people who don’t have a dog in the technology race, so to speak, are going to buy based largely on price, Apple’s mobile “post-PC devices” aren’t just better than their competitors, they’re cheaper than comparable competitors.