Conor McGregor

The Irishman earned an estimated $100 million from the 2017 Floyd Mayweather boxing match alone, plus tens of millions more in UFC earnings over his career. Yet his true fortune came from Proper No. Twelve Irish Whiskey: in 2021, he sold his majority stake to Proximo Spirits in a deal reportedly worth up to $600 million, pocketing an estimated $150 million himself — a sum that rivals his combined fight purses from boxing and MMA. With a 22-6 MMA record and 0-1 in boxing, McGregor has been the UFC's biggest PPV draw for over a decade, proving that personality and promotion can generate as much value as the fights themselves.