Eh...you can build something as good and cheaper than this if you carefully monitor Fry's ads.
$230 for Q6600 + ECS GF7100PVT-M
$200 for 1TB Seagate SATA300/32MB, 7200RPM
$60 for 4GB PC6400 DDR2
$70 for Antec uATX Minuet 350 case
--------
$560
Throw in another $60 for 4 more GB of memory, and you've got what he's got, but with a bigger disk and much, much smaller case (it probably won't be as quiet) and for only $620 instead of $900.I should also add, that your theory doesn't even make sense - the kind of people who buy components from Fry's are exactly the kind of people who will return stuff. What they are doing is just typical retail loss-leading sales in hopes that you'll buy that new DVD-burner* with a higher markup while you're in there.
* or whatever