Both Conor McGregor and Floyd Mayweather made Forbes Celebrity 100 list for 2018. McGregor landed himself the #12 position while Mayweather took the #1 spot.
Forbes explained the following regarding McGregor’s spot:
The UFC’s biggest star has not stepped foot in the Octagon professionally since November 2016, but Conor McGregor scored his biggest payday to date thanks to a 2017 boxing match with Floyd Mayweather. McGregor banked an estimated $85 million for the fight, more than five times his previous top paycheck. The fight had 4.3 million PPV buys and generated more than $550 million in revenue. The Irishman signed a slew of deals over the past 12 months with the buzz around the Mayweather fight. His current partners are Burger King, Beats by Dre, Monster Energy, David August, BSN, Anheuser-Busch, HiSmile and Betsafe. He also has a residency deal with the Wynn Las Vegas for all of his afterparties, and his digital properties, Conor McGregor FAST Program, MacMoji App, MacTalk App and the Mac Life, also generate cash.