Different people have different definition of success. Investing money does not guarantee success. For example, if you pay to buy many tokens, you can build a high quality team. But your opponents in league and cup and probably CL will be stronger. So it is not necessary you have a higher chance to win triple. But with more resources, it is easier to build teams with the looks you liked. Without resources, your team may still success in terms of winning some competitions, but you may not have the player types you like because of limitations of resources to acquire players.