I like what you are trying to do but it won't work. What if a newer user starts training a player just because a NT coach suggested he do it. The user ends up training the player until he has a ridiculously high salary, significantly higher than his other players. He realizes the he made a mistake and tries to sell the player but he can't...because someone suspected his team to be a farm...
The problem is that though some farms are obvious, others aren't so obvious.
Check the Suggestions they are important