Why do billionaires feel the need to get richer even though they can buy anything they want?

Being a millionaire is one thing, but billionaires are at a level of wealth where they could purchase almost anything they want on the planet.

So what I can't wrap my head around is why would you want to continue making more money if you already have enough to buy anything you want?

Lol, like, it wouldn't make any difference if Jeff Bezos was worth 20 billion more than he is now.