It's all too easy to call Floyd Mayweather an out-of-control spender.
His social media barrage of consumption—from the six-figure watches, to shoe closets, piles of cash, a supercar collection and what he calls his "eight-figure mansion"—are all fodder for lectures on financial prudence. His Las-Vegas approach to money has drawn comparisons to other boxing greats like Mike Tyson and Evander Holyfield, who were both laid low by financial problems despite huge winnings in the ring.
USA Today reported Thursday that a Las Vegas car dealership, Towbin Motocars, said it's sold over 100 cars to Mayweather—including 16 Rolls Royces and three Bugattis.
"We never know when Floyd will get the bug for car shopping," said one of the executives at the dealership. "It could be in the middle of the day or it could be in the middle of the night." One time he came in at 2 a.m. and bought "a couple of cars," according to the dealer.
Read MoreDoing the math on boxing's big bout
Mayweather pays in cash, forcing the dealership to buy a new cash-counting machine "specifically for Floyd."
The boxer says he's got it all under control. As he told ESPN, there are so many scam artists and financial predators who target athletes that he's made sure he has "the right people around me, and have my business conducted in an orderly fashion."
And media reports say Mayweather is worth somewhere around $300 million. Next month's highly anticipated fight with Manny Pacquiao could make him another fortune.