Overhere the saying is you create a batch for that one player. Koulierakis is that one of this batch for us. As you need 11 players, the others help the one to flourish and will have a decent education at the same time what helps them in the future earning a decent living. Wherever that may be.
Here the lower tiers (2nd is professional, from the 3rd amateur) but upper in the pyramid, are packed with former players of the youth-systems of Feyenoord, PSV or 020. They have well educated players to their disposal.
So you must see it as a win-win-win situation.