There should not be a token fee to signup your own home grown youth player! The whole purpose of youth system is that you are investing in younger age at your risk, the youth system may generate quality players and it may not. There will be a fee signing a youth into your top 22 squad and that's what clubs do. last youth's production I had was costing me 15 tokens. I cam definitely find an 18 year old in the transfer who I can win for less than 10 tokens.
Also, when you don't want to sign up a youth, I should be able to sell him. I spent 28 days (entire season) working on producing a youth and if I don't pay the 15 tokens, all that waiting is gone wasted. I should be able to sell him even if it's for little money.