Doesn't the money has to go back into the "real" economy at some point, i.e. fill a need besides having a bigger number in the bank account/Forbes list? Or are

Doesn't the money has to go back into the "real" economy at some point, i.e. fill a need besides having a bigger number in the bank account/Forbes list? Or are the recipients of all this wealth already so rich they don't even need another sport car, yacht, villa by the sea or even another forward looking company? I have to admit I don't understand being so rich I don't know what to do with my money. It feels like even if I had billions, I'd try to be an Elon Musk and use my money to create something. Or maybe even buy and bankroll a NGO, a sport team, artists, whatever. Is this already saturated, are all the opportunities that don't look like a sure scam already taken? I feel so out of touch with this world, I struggle to even comprehend it.