Like I said, for my business it's paid for in under a month—there is no money lost, there is no depreciation. Every month I keep it is profit (as far as the computer goes).Maybe that's the difference in our back-of-the-napkin math.
If you bought the base model 14" today for 1999 and sold it for 1600 when the M2 Pro came out, would you be spending more or less money over the 5-7 years?
As for my personal use Macs, I can't remember the last time I sold one... I pass my Macs down to my wife, son and/or other family members. By the time they're done with them they're not worth anything at all because they're ten+ years old. But