Most Americans probably didn't earn as much in a year as Jeff Bezos earned each and every day last year. According to Business Insider, the Amazon CEO's net worth increased by nearly $40 billion in 2017 — the most of any billionaire. Bezos raked in over $107 million per day in 2017. Microsoft founder Bill Gates was no slouch, either, raking in roughly $11 million a day. And "The Oracle of Omaha" Warren Buffet netted roughly $23 million a day.