exactly as mates say... if the Quality of a player end in 4 or 9, 14, 29, 54, 79.... others can see this in the list and do offers.
U can accept, reject, or put a "fixed" price, for example if you recive a offer of 50M, you put 70M, (because is what u want, or you wont sell the player...) and in this case if u put the price, and he pay the $ + Tokens u want, automatically he will own the player.
For u the same.