I’ve always thought it a strange saying.
“Money can’t buy you happiness”
Actually it can if your feckin starving and somebody tosses you a fifty to get something to eat.
I’d rather be piss rich than piss poor that’s for sure.
Agreed that money can alleviate some of the things that make you unhappy (such as hunger), but that doesn't mean it can buy you happiness. There are plenty of things that can make you unhappy (loss of a close friend or family member, for example) that money can never solve. And there are plenty of problems that money brings in its wake (such as false friends only after your money).
Agreed that I'd rather be rich than poor, but that doesn't mean I'd be trouble-free.