If your ST doesn't perform good and you want to sell him, if you 'll give him some earned sp, he 'll become q155 and 6*.- Its easier to sell a player q9 or q4 and it may cause a small bidding war, so if you have a player lIke him and have some extra sp, count them before give them to him (he 'll be q0 or q5). Better waste them. Those are the most difficult to sell, players.
Then it's hard to sell him. So you must count how many sp he needs to be q155.