If I am not interested in selling the player and some moron puts 0T, I put a selling price of 20T, the max. IF they want to give me 20T, good for them. They might as well just buy a scout for that price.
I have been known to seek them out on FB and send them a quick note telling them to stop as I wont sell, or if I am interested in selling, to up their offer or dont waste my time.