If you are not a toke buyer- do NOT waste your tokens on going 20 rounds (hell, even if you ARE a token buyer don't do it). The higher up you go, I have found, the LESS tokens I need to spend for the better players. It's all about getting the young, fast trainers that are near a new skill point. If you find good ones, they can last you for many seasons (I have a player that is now 26, bought when 18 and is still the best in the league).