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You write:
> After just a year or two of use, a Windows
> machine gets so gummed up with spyware,
> viruses and other nasty stuff
Let me be plain: I am a Mac user (MacBook Pro, Mac Pro, Mac mini. My wife has a MacBook).
I think they are truly great machines and OS X is nearly second-to-none. But your statement lacks credulity.
I can buy a used PC / PC laptop and reformat and re-install the OS (from the disc the seller *better* be providing me!). Or I can skip that process entirely, and buy a very inexpensive PC. I don't consider that PC on par with the Apple computers I have purchased (they are budget-oriented and lack most of the hardware features I want and get from a Mac).
But I'm not sure your "resale" argument is valid.