If it was a straight up deal, maybe. But they would of had to take on his contract most likely, and to a team that has had such disappointments as Mo Vaughn and Alomar it could be a big decision. Aren't they still paying Mo too? I think they also know they won't be a contender, even if they do add Soriano as there pitching staff is not very good. Soriano also came off a big slump at the end of the year and by my standards isn't playing that well this year (most of his numbers are down across the board). Switch around runs and rbi's and i think most would say Reyes could have those stats if he was playing (maybe less hr's, but more sb's).
I know what your thinking, those are some small reasons. Just trying to say as a manager it isn't as easy as saying Soriano is better then Reyes. It goes beyond that and money is a big deal. Just look how most teams hold onto their prospects though they could trade them for a real good player. Fantasy GM and a real GM aren't that similiar when it comes to trading.