Yes, Apple computers cost more than their PC counterparts. Some of that, in my opinion, is unjustified...but some of it is. I have used both in my job. In fact, I just got a 17" Macbook Pro. Here's some of why I was willing to pay more for a Mac:
* 2.3Ghz quadcore SandyBridge processor
* 1900x1200, accurate, Matt (non-glossy) display
* silent (until I unleash the the processor or GPU)
* aluminum unibody contstruction (build quality and durability are not irrelevant to me and I admit, I'm willing to pay more to get them, significantly more obviously)
* I have the option to very easily run Windows (either in a VM or as a dualboot)
I know Dell makes a workstation that can compete with its specs, the Precision Mobile Workstation 6500...but when I configured it as closely as possible to my MBP (Dell offers the i7-940XM as apposed to the i7 2635QM and the Dell offers professional graphics) the Dell costs MORE than my MBP @ $3,127 (on sale, $3,686 normally).
Now, that Dell has some things the MBP does not, ie., eSATA.
That Dell is the kind of machine the 17" MacBook Pro is meant to compete against, its a workstation...its not the $1,300 plastic Asus gaming laptop.
...and I'm pretty sure the MacBook weighs notably less (over 2lbs less) than the Dell and has significantly better battery life (7+ hours) than the Dell workstation.
I'm not saying the MacBooks are priced to be a great buy, or that they're the best choice for all, because we all know they're not. I'm just saying to compare them fairly to the machines to which they're meant to compete and not to cheapest plastic gaming machines you can find.
...just an opinion.