He was the champ, of course he got more money. I actually enjoyed the fight, especially when Oscar cornered Mayweather and unloaded on him while Mayweather had an "idiotic nigger grin" on his face. (as my friend so affectionately calls it)
And to everyone bitching about Mayweather being a big jerk and all that, yeah, of course he is. Thats how he hustled the fight. Thats why you watched it.