It's not needed. It's really cheap to join additional leagues if you so choose.
But once you get rolling in this game with your game planning, over rides, roster management etc.... you'll see that after you do all that and look up at the clock a lot of time has went by. I guess that's a definition of a good game now that i think bout it.
And if your in a good league, bragging rights is worth more than 25 credits.
But now that you brought this up, I would like to see Championships listed on our GM cards.
Maybe on another tab on GM's cards that show league, conference and division championships. As a league owner I look at a lot of GM's cards and it would be kool to see how many championships they have under their belt.