I think it's not a good idea to leave the question unregulated... If a gamer finds himself in a situation that force him to get his player back from transfer due to injuries for example it could be easier to add an option to get the player back paying a small fee... in this way bidding on owned player could be declared illegal.By biddin on a player of mine I can fake the final price and also by doing this in the end of the bidding i can extend the bidding time by 10 or more minutes!!