If you spend $35k and just idle the machine or just check e-mail you've burnt the money. If it's your work machine and you've got a $100/hr billable rate it's paid for in a little over a month. Three months at a $50/hr rate.
If you bought the $35k Mac Pro in 2023 when it was released and have a $50/hr rate it's been paid off for about 30 months. So as of today those owners probably aren't too broken hearted. They'll likely get at least another three years out of them.
People buying $35k Mac Pros probably paid them off after a single contract. So they've just been making money rather than costing money.
>If it's your work machine and you've got a $100/hr billable rate it's paid for in a little over a month.
Are you working 996 weeks or something?
At standard 40h work-week the math works out to 8.75 weeks to "pay for itself".
I think these calculations are a bit bogus.
If you spend $35k on a nice computer, and then earn $35k from doing some work using it, that doesn't mean that buying the computer has paid for itself unless the computer is solely responsible for that income. It probably isn't.
It's not necessarily even true that after doing that work it's "paid for", in the sense that getting the $35k income means that you were able to afford the $35k computer: that only follows if you didn't need any of that income for other luxuries, such as food and shelter.
If you're earning $50/hour, 40hr/week then what you've done after 17.5 weeks is earned enough to buy that $35k computer. Assuming you don't need any of that money for anything else, like food and shelter.
If the fancy computer helps you get that income then of course it's perfectly legit to estimate how much difference it makes and decide it pays for itself, but it's not as simple as comparing the price of the computer with your total income.
Regardless of how much it contributes, if you have plenty of money then it's also perfectly legit to say "I can comfortably afford this and I want it so I'll but it" but, again, it's not as simple as comparing the price of the computer with your total income.