Hmm interesting... you suggest more than one owner:But as you say, it's the owners' rules.
"owners rules" - carp grammar (by me)
"owner's rules" - correct grammar for one owner
"owners' rules" - correct grammar for multiple owners (by you) !!
Well, I wouldn't know, but I'm assuming it is owned by more than one person. If it is only one person, they've taken on a lot.
If nothing else, a rowdy bunch of mods..... wouldn't want to be at that Chrimbo party ..... (assuming they're of the christian bent...!)..
now your being a homophobic racist.