Mayweather vs. Margarito who would've won?

Channel 206 on Directv:

Arum said while Mayweather would have taken the $8 million to fight Margarito, he asked for a $10 million guarantee to fight opponents such as Miguel Cotto and Ricky Hatton, when Arum was only willing to guarantee $7 million.

Arum said Mayweather also asked for $20 million to fight De La Hoya, a fight Arum said he wasn't interested in participating in.
"That's not in the cards," Arum said. "He wants $20 million for the De La Hoya fight? It's not there. Sometimes, my man, you gotta know when to hold 'em and when to fold 'em. We'll talk about things down the road."

 

Because he built his legacy around it. He made it a point to WAIT, or duck, or retire if there were threats he wasn't willing to risk his coddled ZERO on his record.

That's why.