I'm on level 28 now.

From my 27 full seasons -

22 League wins, 3 League runners up (Finished 3rd and 4th in the other two seasons)
12 Champions League wins, 4 runners up
3 Cup wins, 1 runner up.

I've never spent a single penny on this game. Promoted every season and constantly do very well in the league. Only the cup seems to be a wash out for me. In fairness I did farm tokens like mad, so don't stick to a 35 Token limit, but at the same time, for a team that I have never spent a penny on (I did get tokens for opening a couple of betting accounts - but I was opening them anyway, so the referral was an added bonus) I'm pretty pleased with that.