The world's second richest billionaire — Amazon CEO Jeff Bezos — makes an estimated $3,715 every second, which is three and a half times more than the median full-time weekly wage for most Americans ($984 per week).
To quantify that wealth even further, for Bezos, spending $88,000 (that's 2.5 times the median yearly salary in the US) is like spending $1. And that's in 2018 estimates.
And there are "evil" billionaires. The billionaires mentioned here are from the western world. In some countries (i.e. UAE) billionaires treat their workers like slaves. I admire Elon Musk very much for what he achieved, it's almost superhuman but contribute to society by paying taxes!