Mark Cuban Planned To Quit Working After He Made Millions In His 30s: 'I'm Not Retired Because I'm Too...'

Billionaire entrepreneur Mark Cuban has founded several successful companies. Cuban is also a minority owner of the Dallas Mavericks and has starred on the popular television show "Shark Tank." He wouldn’t be where he is today if he retired in his mid-30s like he originally planned, and he owes a…