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I have always suspected this author is a total idiot; this post just proves it. Notwithstanding what others have said about the stupidity of the resale value argument, this line stands out:
"After just a year or two of use, a Windows machine gets so gummed up with spyware, viruses and other nasty stuff that it seems malicious to ask anybody for money for the thing..."
This is total crap. Any computer, Windows, Mac, or Linux, that is used by a person without knowledge of how computers work will end up badly. A Windows machine that's used and cared for by someone with even a bit of PC knowledge runs consistently, reliably, and with rock solid stability.
The Dell E1505 that I bought in 2006 for $1800 runs today with ZERO problems. At that time I considered a MacBook Pro, but the same config as the Dell was near $3000!! I have since upgraded and modified the Dell, so it remains current, and it still has not cost as much as the MacBook would have.