I would type out all the prices for you like I usually do with game manual reference answers but you should actually just go to game manual -> Standings and read that page. Then also read the rest of the game manual and the guide to BuzzerBeater in the forums. They both are really useful to new players. Some of the information in the guide is old, so read it with a grain of salt.
What the game manual and guide don't tell you is that you can promote without winning the league as there are teams promoted from a lower division with the best record to replace bot teams in the higher ones. You lose attendance for non-championship winning promotions so take that as you will.
So you get:
Money for Winning
Attendance Boost next season
Money for promoting
2x NBBA Champion: S55, S56. 3x USA Cup Champion: S54, S55, S56. WR for longest home streak ever at 11 in Season 47.