Like I know people with cracked macbooks (yes unibody) . Unibody is more a gimmick then anything that is really very effective.The Macbook Pro frame alone may be worth it because it houses the components. Sturdy, heat dispersing, durable...it protects the components inside. I know someone with an XPS that has cracks and some keys fell off. Yeah thats quality.
Windows is just as much supports the hardware it runs on, its all generic .The OS is designed to work specifically with the components installed...the same can never be said for Windows machines. Plus I can run Windows and OS X on the same machine if needed.
IMO any price premium placed on Macs over Windows laptops is because of the quality build, and the symbiotic relationship between OS X and the hardware chosen. You get what you pay for and the XPS, while not a bad laptop, isn't built like a Macbook Pro.
And as I always point out the resale value of Macs tends to be very good. Even just a $500 resale value 3 years down the line is $500 off the price of a new Mac, combined with a student discount suddenly the price "gap" between Dell and Mac is a lot smaller.
Why would the combination of something cost more? Shouldnt it cost less, after all osx doesnt have to support 100+GPU/CPU's and HDD's .
OSX has also lost any edge it had since windows 7 .
As for resale: yes but for people who use there laptops until its broken, this doesnt matter.