1. Floyd Mayweather, Jr.
Mayweather has had an amazing year. He has shattered the record for earnings by an athlete with his $300 million year. The bout against Manny Pacquiao was a record breaker financially with the PPV purchases, gate proceeds, and sponsorships. He made some endorsement deals to add to his income with FanDuel and Burger King, and is planning to fight once more to fulfill his Showtime deal that netted him millions and then retire from boxing.
As you can see, a celebrity can have a very good year, but there will come a time when they will fall off the top list and make less. That is why it is so important for them to find ways to diversify their talent and money to allow them to live comfortably for the rest of their life.