If you have a player who is a four star player and you plan to sell him, add skill points until he is one skill point from five stars. Then sell him. It makes him much more desirable since players a level below you will see him as a five star player about to become a scout. If you add the skill points to make him become a low five star player, the player is available to players on your level and above and isn't as desirable.
Edward FC currently on autopilot
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K Vegas FC currently on autopilot
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Tarcanes92's guide to adding seats to your stadium
Tarcanes92's collection of Nordeus official articles that explain the game