Um, no.
I usually win the league in the seasons I dont tank and I never put win bonus, in the league.
I will sometimes put a win bonus if I lose the first game of a cup, and will usually max it, but it hardly ever works, which is good since I would lose more money than I won from the game. but at level 11, money is mega important to get new good players and I cant afford to upgrade the stadium unless I go far in the cup and CL because I need $152M.
So putting any win bonus screws you for money in the later levels UNLESS you buy tokens.
My advice: NO WIN BONUS. you can still easily win the league and CL and cup without it.