His style is very effective because that gaves him fortune and he has an undefeated record.
Maybe there's a lot of people that are annoyed with his style but we cannot deny the fact that his stats speaks a lot for his success.

let me share you some :

Top richest boxing in 2019

https://wealthygorilla.com/richest-boxers-world/ (Mayweather is in the number 1 list with Net Worth: $560 Million) while Manny is rank number 4 with only $190 Million of net worth.