Have that attitude about your purchases for 10 years, wasting at least $4000 a year, and you've wasted $40000. That's significant even if you do make $100k.
Who buys a new computer every year? That’s just silly and a waste of money.
You don't buy a new computer every year but if you carry that attitude around with you then you're probably wasting comparable money elsewhere.
in 10 years that's a $1m. Even if you bought a mac pro every year that's not particularly significant. Of course, it is a lot of money by itself and if you are smart about it you can save a lot, but the value is there for other people in not building a custom PC with cooling.
You did get something in return for that 40k though.