I play on lvl 20 at the moment. So I can tell you something from my point of view. I never buy tokens, I earned tokens. Some season I bought scouts with nearly 7 stars. Some of them play very well, some played crap. Last season I have the best Q in my league but players (more than half) ratings was low. And I didn't won promotion. Few seasons ago was the same story. So I decide buy players from my friends or from TL which have 5, 4 or even 3 stars but with good ratings. And currently I'm first in the league. Few seasons ago when I do the same thing I finished second. So I'm preety sure I will no buy any more scouts. I can buy even 4 stars player but with good rating. I think this is 70% of success. 30% is tactic. But this is only my point of view.