Interesting points from both.
Some people actually like being frugal, aka driving much less of a car than they can afford. WB is of course an example. Maybe they get off on power, etc.
Sometimes it also could be a work place. If you suddenly show up with a Lambo or McLaren GT in a middle income workplace, there might be too many questions.
On the other hand, what's the point if you can't spend a bit.
The rich stay rich by acting poor. The poor stay poor by acting rich.
The blingiest people I've come across never had a pot to piss in. I have an in law who's the richest person I know. He makes a couple of million quid a year. The last time he stayed at a fancy hotel the staff asked him to hide his 2003 Skoda out the back.
And many people are born doomed when it comes to money. No matter what they can't make the best of it or hang on to it. I've seen it many times. It's a talent as much as anything and you can't teach that.
Actually...
No talk about rats and how similar we are to them today, just one word. Amygdala.
The bigger it is the easier it is to earn and manage money. And we know what makes it grow. So, to whatever degree that part of the brain matters, it can be taught. Even self-taught.