As the general managers' meetings begin in Orlando, the Marlins are telling teams that Miguel Cabrera, 24, their four-time All-Star, is on the market and could be traded by December. Why would the Marlins, with the worst attendance in the game and desperately trying to land a stadium deal, unload their best player and one of the top hitters in baseball? For one, Cabrera - who made $7.4 million last season - stands to make at least $10 million in arbitration this winter, a challenging price tag for a low-revenue team. Also, despite averaging 31 homers, 116 RBI and a .327 batting average the past three seasons, he has had several troublesome episodes. He has been benched a couple of times for arriving late for games, his weight is a concern and sources say the Marlins are frustrated with his overall attitude and approach.