it does not matter how much you invest for quality of player the only thing that changes with investment is the amount of time it takes for youth to come through, i`m fully built and get youth every 12 days, and as well getting normal 2 star for no tokens which i sign and train (if get early in season ) then sell on first day of new season once i add skill and the 3/4 star player can be any thing from 12 to 24 tokens with 24 tokens being fastest trainer but i don`t sign as DID get better in market for less tokens so i release, that being said if they (Nordeus ) added a special ability to youth that cost say 18/24 tokens then it would be worth signing