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...but they're built like cheap Chinese cars.
My main machine at home is an old G4 Power Mac. And I still use an old G3 Powerbook for backup or writing when my G4 Powerbook is serving media centre duties. I bought the Power Mac in 2001 and the G3 Powerbook in 1998, and they are still going strong.
The new batch of Macs? I doubt it. Starting with the Titanium Powerbook, which I once owned, the quality of Macs have gone downhill. The hard disk in my Titanium Powerbook crashed twice (I lost all my data) and heat was so bad, the rubber feet became squishy and later 2 of them fell off. I sold that and bought the then-new slim iBook; heat warped the case and the mainboard had two meltdowns.
The high resale value of Macs is actually a carry-over from the old days when Apple used to make reliable machines.
With Macs now designed to be a commodity (hey, you would sell yours after only a year. Even my washing machine and fridge last longer than that!), I have a feeling the resale value calculation will change in the near future.