Will Matt Cain Ever Be Worth Owning?

Watching Matt Cain pitch last week against the Mets, I couldn't help but wonder whether he's destined to be the next Jeremy Bonderman: a guy with great potential who's always a start away from being a $20 pitcher; but a guy who, until he's that $20 pitcher, will always be overhyped and overpriced. (And, if you want to take the comparison a step further, could even start providing a dimishing return.)