I think the system with training points in this game is an excellent idea.
I think I would enjoy it more if I could choose specifically which trait to improve on, and not just defence attack and physical + mental.
Another thing is that there should be a way of canceling a sale of a player.
Today I accidently put one of my 18 yr old midfielders on sale.
I didn't mean to sell him, I was actually trying to sell an older player.
So I only made a simple mistake.
But there seems to be no way of pulling him off the auction list once he is on it.
It would be nice if this was possible, so I could avoid selling the wrong players by accident.
Otherwise the auction system is a good idea.