Nah, there is definitely a truth to this. I grew up in a working class family who moved into a wealthier region at some point and I would never trade places with people who grew up wealthy. Pretty much all wealthy people are constantly unhappy, are obsessed with control to the point where they alienate their families, they are constantly scared of losing their control, status and wealth, constantly paranoid towards everything and everyone and often engage in self-destructive behaviour.
Of course, not having enough money sucks, it generates stress and restricts autonomy. But a similar thing happens at a certain level of wealth.
Again, my point isn’t that poor people are happy or happier than the wealthy. My point is that our system doesn’t even beneft those who are (supposed to be) in charge. They think it does, but it’s more like an addiction that controls and destroys them.