Don't forget though - a manager (like a trainer) would often be there from day one, not even earning enough from the fighter to fill up his car during the period between fights! I think 15% is a lot myself - but if your manager does a good job I suppose he is worth the doe.
Haymon was a music promoter, not producer. http://findarticles.com/p/articles/mi_m0EIN/is_1999_May_20/ai_54677789
if haymon was working with people like whitney houston and boys 2 men whats he doing wasting his time with andre berto, vernon forrest and paul williams? and why cant i find anything on google?
to paul williams, andre berto, vernon forrest and floyd mayweather? i dont see any of them except for maybe mayweather getting him the kind of money big time artists could have got him.
He seems to have tens of millions right now but the way he lives, it wouldn't surprise me one bit if he loses it all later in life.