The tokens go back to Nordeus.
You can do surveys,offers and watch videos for tokens for free
You can direct transfer/use negotiations @ level4+ where you can offer players tokens + money (some of the tokens go back to Nordeus)

Tokens go back to Nordeus as thats just how online games work,no different to buying a money pack on an MMORPG then using that money to buy something from an NPC ingame.

It's your choice to continue bidding on a player and to use your tokens, I find it better to save up for U21 Players (Just signed an 18 year old rated 37 worth 7M for 21 tokens) or Scout Players.