Aca team arent that expansive and can lead to massive economy on the long term.
You buy a 16YO player, for absolutely nothing, train him for 2 years, pay him a little bit for 2 year, extend contract for a long time : Poof you're not having to fight with other team on the market transfer to buy him. If you play your cards well it's Low risk (Really not expansive), High reward
I come from France in soccer all our city team are bad, but we may be one of the biggest league in world when it comes to formation, some of our club economical model are fully based on formation and selling player to biggest club. Well Val isnt soccer and technically a player bring money to the club they formed all his carrier, so not really comparable, but welll you got the idea