I think that there is a problem with the current limit of sell/buy prices when it comes to young players. They don't have such a high market value, as they are not great yet. But you can see that they will become great players, yet you are not able to sell them for a price worthy of their talent, which is why you might not sell them at all.
This is just an example i found for the occasion:
This player
http://rockingsoccer.com/en/soccer/info/player-160161
with high talent, endurence, power and speed, will most likely be worth a lot more than £37000, yet the owner can only receive bids for £45913.
I know that when a player is for sale, the price can go up, and i have seen this happen in this window. I can't find the player now, but he was worth around £30000, and sold for £95000, which is still extremely cheap for a player with the talent he had
I think this will become a problem and already is. Why risk selling your talent for such a stupidly low price when he will be worth much more later?
And where is the risk with buying young players? If i can get a possible star player for £10-50000, why not buy as many as i can? It won't have such a big impact on my finances early on, and i can just sell them again with profit if they don't turn out as good as i need. Large clubs will in a few season just hunt small clubs for their talents, and they can buy them all for very little money, and the small club will have made a very little profit, if they choose to sell. And if they don't want to sell, then we will just see talented players, loose their potential on small traning grounds, because that is actually better fot the club, than earning £30000.