In Major League Baseball, it is often not only important to have great players, but ones who are marketable as well. This could mean either people who can become well-known in the game, or it could be people who would provide great trade value.
Conversely, those with ridiculous contracts or those who are clubhouse cancers end up being players who are not marketable in the slightest. Some teams know exactly who this player is, and while it's still possible for that player to be traded (Carlos Zambrano for the Cubs comes to mind), it's far from easy.
Here is every team's least marketable player.