Orlando,
If the Yankees win 15 games with Clemens on the mound, it will be worth the money they spend on him because the Yankees will win their division. It really will not matter - the money he will generate will more than pay his salary. And no Hughes cannot fill in for Clemens and do just as good a job. BTW, I am no Yankees fan - just think Clemens's splitter is good enough to make him one of the best pitchers in baseball.