It's looking like OSX wont be able to be Apple exclusive for much longer, which was inevitable as soon as Apple went intel. It looks to me like apple is preparing for that, but they're not quite ready.
Anyway, yes, macs are more expensive, but the bottom line is that sometimes they are just worth it. The technical support is better than anything else you could possibly get with a PC. 150$ for a 3 year warranty, and by default they come with a 1 year warranty. For some people the peace of mind is worth the extra money, and really the difference isnt as big as most people make it out to be,
The new macbook pro 15 inch has a 2.5G processor, 4GB ram default with 8gig capacity, 7 hour battery life, 1 year warranty, etc... find me a similarly specced PC laptop (taking into account weight and size, mind you) for 1700 or less.