I have him in a 14 team league and I'm not particularly deep at RB, so I'm most likely going to keep him. But if I WERE going to trade him, what should I ask for in return?
according to Michael Fabiano (Fantasy Live, NFL Network), "you should take Rainey and Tony Gonzalez and go get Gronk!" -- good luck with that, but kudos if the Gronk owner does it.
I would take what I can get if I needed a certain position.
He's the hottest player right now and I'm sure Tampa will ride him til the end of the season (since they have nothing else to play for). His stock may be high, but I wouldn't trade him.
Unless this is also a keeper league. Since it remains to be seen what will happen with Martin in 2014, it might be worth it to trade for a permanent elite starter.