I'm not going to say that the rich are just as unhappy as the rest of us, because they'll never know what it is to truly struggle. But take a look at Elon Musk; does he look happy to you? Dude bought and destroyed Twitter because people there wouldn't stop making fun of him, and he still can't stop them. He's driven his daughter out of his life because he can't accept she's trans, which has only made him go even more full on transphobe and bleed over into every other bigoted thought under the sun. He just fucking gutted Tesla, his big pride and joy, because he couldn't stand his "inferiors" talking back to him and trying to stop him from making terrible mistakes. All his victims are undoubtedly struggling more than he is, thanks largely to his capriciousness and evil, but he certainly doesn't look happy to me.
And the funny thing is, he could be absolutely happy if he could let shit go. If I had his money, I wouldn't even bother with all this petty shit; I'd hire people to manage the money, put as much of it into charity work as I could, find some tropical island somewhere, and spend the rest of my life sipping on margaritas and watching sunsets. But he can't help himself. He's incapable of letting go, which stops him from ever being happy.