Guys that make 20 million trading stocks do not quit and go lay on a beach. They keep competing. Humans have a need for goals and purpose. I'm motivated by money to a large extent, but that varies among people. I would make the case that the guy teaching algebra and coaching football with a great family has a better life than the guy with 50 mil laying on a beach and doing coke and whores.
I just believe that money without purpose would be pretty empty. Most disagree, but try doing nothing for a month.