Going by my experience I would say there is something I what Pétur is saying.
When I used to buy tokens at the start of each season I done really well each season at least winning the league each year. Since I stopped buying tokens my results have been awful even though my teams quality has not changed. It has got so bad that despite having the second strongest team in the league last season I finished 12th and I haven't changed anything that had won me leagues and cups in the past.