Youth and development center

A building that allows you give x amount of gold balls and money to develop a youth player. Depending on amount of gold balls and money depends on the quility of player you get from the youth. You can also put one of your existing players in the development centre and depending on the amount of gold balls you pay the player will improve 20%.
Sounds like a good plan, but developers are only after $$$$ from one time offers, so I doubt they'll even consider it