Correct, but it turns out, a fair fraction of the people who day 1 purchase a GPU for that much may not necessarily be described as wholly sane.

your comment makes me wonder...

Is it a computer science type person, who might be unaware of electrical engineering...

Or someone who takes a perfectly good car and adds ridiculous rims that rub?

They aren't insane, just not thrifty with their money.

Doesn't mean they prioritise everything the same way. Plenty of people buy an expensive car and put cheap tires on it or what have you.

Yeah, I can easily see someone buying an expensive GPU but a cheap power supply because they ostensibly all do the same thing

They're not necessarily insane, I agree.

But I've also known some people who did that when they did not have the disposable income to do it.

Let's not forget that the 90 series cards in each generation won't be top end forever. Soon they will just be used cards like all other technology. And someone might be building their first computer, got a good deal on eBay on a 5090 which is 5 or 6 generations old, and cobble it together with some other old parts, and maybe a weak PSU, or an older 12vHP cable