Actually, 8 ball rules in American pool are the bastion of sanity compared to 8 ball rules in English 8 ball, where every single player plays a slight variant and every single player swears blind theirs are THE rules.
Sounds like there could be a good Monty Python skit from this concept.
Oh, and there are many different sets of rules so there can be many different leagues to ensure your enjoyment, and take your money, as well.