Stanford's endowment is over $20 billion. I think southern cal is around 5..... I doubt Shaw would ever consider southern cal without laughing hysterically. He is very very happy where he is at.....
USC is a blue blood. They have more fans, more exposure, better recruiting than Stanford. USC would happily pay SEC money for the right head coach. Stanford hasn't so far shown a willingness to pay top dollar.
He might be content to stay in Stanford, but an extra $2 million per year is nothing to sneeze at.