Cuz Broner is nowhere near as good as Floyd. They are not the same thing that chose to try it different ways. Broner is good but thats it.
This is the thing. Broner was fighting a 40 year old Pacquiao. He would never have a better chance to beat a HOF. But as I said before winning and losing isn't the be and end all for Broner. His all about the pay cheque. Floyd was all about the money but he never wanted to lose. Was still driven to actually win.
Mayweather = A+ Talent + Insane workrate + Looks after body outside of ring Broner = B Talent + Mediocre workrate + Doesn't look after body outside of ring Mayweather is also 2 inches taller, 2 inches longer.