Floyd "Money" Mayweather is undefeated and has held titles in every weight class he's fought in, but his demeanor and antics have soured most of the female fan base and the casual boxing fan. Inside the ring Mayweather is a defensive magician. Many and all fighters have thrown punches in Mayweather's direction and one second he's there and the next he's not. All of his opponents have looked foolish for swinging at air and making fighters who usually land a high number of punches land several percentage points lower. When Mayweather tucks his chin behind his shoulder it's almost impossible to get through to land a flush hit. The casual boxing fan has grown tired of watching a fight where the outcome is always in Mayweather's favor and where there's a lack of offense because of Mayweather's defense and because his knock out power has seemingly gone away. So if you're a casual fan it isn't difficult to understand why you would rather not shell out the 60 or 70 dollars to watch a boxer "run" around a ring and still win the fight.
Mayweather's expensive tastes and the way he flaunts the amount of money he's made off these "boring" fights have also alienated fans of boxing. Mayweather is considered to be arrogant and stubborn and has tailored his demands from the challengers, who step up to fight him, to make fights relatively easier for him to win. Being an undefeated champion does have it's benefits and Mayweather takes full advantage of these benefits. As many fans support Mayweather there are as many, if not more, who order the fights just to see Mayweather lose and they've been disappointed 48 times. So as Mayweather sets up to finish his storied boxing career with his last fight in September against Andre Berto I expect to watch the defensive magician work his magic and end his career with as many losses as he started with.