I agree though that such leagues are more fun as compared to the usual leagues in the game, especially when it consists of users you 'know' and can communicate with.
yes, that's the spirit.
As about cheating, even if someone try to do it, it cannot make much difference.
Let's say if someone can earn some extra boosters. So what ? make 2-3 players +1 q more (26 >6* instead of 25 or 24) ? Doesn't make a difference.
A big cheat from the other, would be too obvious for an experienced manager