> Ellison, 76, who has a net worth of about $75 billion, according to data compiled by Bloomberg, owns 98% of Lanai, Hawaii’s sixth largest island that’s mostly made up of Ellison’s luxury hotels and resorts. Ellison is the main employer of Lanai’s 3,000 residents. In addition to his three hotels, he also owns a significant chunk of the housing stock as well as the main grocery store and the monthly newspaper there.

Wow, it's a literal company town.