They don't, there is an empty void in them, typically from an insecurity in child hood. For example I know a very successful guy whos goals are amassing wealth because he said as a kid they were poor and it made him feel insecure and unsafe. So now his happiness is earning more and more. Billionaires have this trait. Whether that be financial, or I have to be better than the next guy to feel like I'm not a failure.

If life is happiness and living and not economic success, you'd see that billionaire trait die out, its a selfish trait that serves no need in a community