I fully understand how the game works i'm at level 44 and believe me the availability of fast trainers is very scarce and when they are available in the transfer market every player and his dog is after them. The easiest way to or should I say the less costliest is to purchase through the negotiation option but even then if you don't gain tokens through your ads n video's you will end up either purchasing tokens or simply revolving around the 25 - 28 yr old players that you then simply cannot offload and this is where the major flaw is in the game.
Yes if your in the lower levels where there's an abundance of quality young player then it works fine.
At present my budget is just under £1 billion and the cheapest players to purchase start at £120m +