You are greatly underrating Pereyra here. In today's market, bench players of his characteristics can easily fetch you 15m and he is coming from a rather good season. You make it sound like he is Padoin type of player. Youngsters, like we have seen on numerous ocasions, from Chiumento, Palladino, Giovinco, etc... can go either way. It is far from certain that they would turn out into the players you expected them to become.