someone's going to feel like a party is not paying their fair share, and there would be dischord. how would that get settled?
The party feeling discord makes it public that the persons in question aren't putting in their fair share. People respond accordingly; if they care, the persons get a bad rep, and if they don't care, the persons don't. If you get a bad rep, it gets harder to function around people. If you get a good rep, it gets easier.