what is it then? A waste of money? Does a car qualify as investment? (just checking, english is not my first language, maybe I have a different definition for that word in my mind)
From dictionary.com:
the investing of money or capital in order to gain profitable returns, as interest, income, or appreciation in value.
Unless you are selling your old MBPs for more than what you bought them for, they're not investments. And very few cars are investments - less than 0.01% of all cars are. These things are all depreciable assets - they do not increase in value over time.