As of 2015, there are no specific sources that explain why Floyd Mayweather Jr's videos are so popular. However, Floyd Mayweather Jr is a popular boxer because of the tremendous contrast between his character out of the ring and his character in the ring, according to Business Insider.
Outside of the ring, Floyd Mayweather Jr has been described as obnoxious and offensive, says Business Insider. This is designed to make his opponents underestimate him and become uncoordinated because of their anger at his personality. When it is time for the two to fight in the ring, Floyd Mayweather Jr becomes calm and precise, tactically engaging his opponent in an unexpected manner, claims Sherdog.