I won the JBBL title 3 seasons in a row but not last season.
I made somewhere between 800k and 1million less this season I think overall. That is a lot.
This is no reward(other than B3 eligibility) and a bonus to the following season's attendance. Sounds like your comparing 3 seasons of that bonus, to a season without that bonus. Additionally, your opponent is a factor in your attendance draw. Hosting a 6 win team, you will draw less then hosting a 18 win team.