If you transfer list or offer out the player then it indicates to clubs that you want rid, why would they offer asking price or above? The winger in the championship may have had higher potential, a longer contact and be an important player to the selling team so they will demand a higher fee.
The clubs accepting fee's I'm not so sure about, but in my Go Ahead Eagles save I'm in the Eredivisie and if any of the top domestic clubs make offers for my players I ask for a higher fee compared to foreign teams, same with clubs/managers I dislike (either in game or real life). Maybe the player h