My main team is on level 20 where average season wage of mine players (avQ high 4*) is ~10M so sum is ~200M for all players. Meanwhile, sponsor contract for one day is 1,23M, max. 34,44M for whole season. That means income (from sponsors) covers only 1/6 of wages. That means every team which wants to survive financially on such high level, needs to win treble or to archieve high finish (top 3/top 4) in all competitions. That's silly.