In levels where money is a big issue, the token youth worth a shot.
He cost no money, in fact you can usually get more money from those token for signing him and sell him instead of getting bank investment. But usually it is better to let him play in your team even if the rest of your team is 5* or above. Form is usually stable it is better let him stay in most cases. He will gain a lot of market value even if you don't powertrain him, so if you have space you'd better off keeping him and sell him at age 20~26.

He is also a fast trainer that involve no risk to get other than scouts. In bid war you can lose a lot of tokens for nothing, and players on the nego list are rarely fast trainers.