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I do not buy a computer, or a car, for its resale value. This sounds like BMW logic to me. The problem with that analogy is that a BMW is a very nice automobile. the Mac is still an unusable piece of crap. No wonder they have higher resale value, after two years they will be just like new. They are not used for anything but running the OS.
If you end up with an unusable pc after two years, you do not know anything about using or maintaining a computer and should probably keep using you Mac in your parent's basement.
Why are all your price comparisons based on year old data? Computer prices change everyday. Not only that, but obviously the only market for used macs is to existing mac users. Pretty small market. But they are used to over paying for stuff.
In todays market:
Entry level pc laptop about $500. Mac $1100
Loaded pc quad core, 4 GB ram 500gb hd dual nVidia 8800 $2500
Comparable Mac $6000
This is not an insignificant difference. Macs are like BMWs in one way, they are both over priced status symbols.