Agreed, but I think he made a good choice. He made 25 mil on that fight... what else does he want to prove?
I think Mayweather is a lot like Roy Jones, in the sense that he relied tons on pure talent and speed for defense. He's getting out now while he's undefeated/champ. If he keeps fighting into his mid 30's his speed just won't be the same and his legacy will be tarnished, just like Roy Jones.