Well, on transfermarket you need luck for every player, you can't know how many tokens will someone spend. I've been using nordgens for while, with 35T per season they are my only chance to keep team competitive. Although nordgens are expensive, advantage is that you don't have to buy new player for few seasons so it gives space and time to earn enough money for players future replacement. My GK should play 4-5 seasons, club will have money to replace him.
Great difference is between changing 6-7 or 12-14 players per season.
Have you tried to buy nordgen through negotiations?