Because he stands to make s*** load more money if he does, sure he can get 25-30M or whatever it is for the next 3 yrs or he could get a 6 yr 170M+ contract by hitting the Market.
If he does OPT out the Cashman will have to re-nig on his "We won't resign him if he opts out", which is BS, hes going to OPT out, this was the only leverage that Cashman had, he used it and I don't think anyone is buying it, I'm not, The GM of the Fing NYY threatning not sign someone because the money will be too hi........ I can smell the BS from Holland. When he opts out they will try to sign him, if they do, thats anyones guess but they won't let him walk out of town with out atleast talking to him, that would be the dumbest thing ever.
If he walks and goes to Boston, there might be a lynch mob for Cashman, AROD has come along way since last season with the fans, proved that hes the best player in the game and carried NY's sorry old ass's for the better part of the first half if not the whole season.