Even the Rules Committee has stated that the reason that the moxen remain on the banned list is due to price.
Little bit of difference in banning a $70 card because of price and banning a $2,000 card because of price.
If there's going to be a threshold for price ban then IMO, it should be decided across the group AND if that's a thing than it needs to include all cards over that threshold if it's truly about financially evening the playing field.
Hey hey hey, you can get an unlimited
Mox Ruby on ABUgames for $1150 so they're not THAT expensive ; P
Seriously though, it's starting to sound like the argument is more whether a given card will make you an automatic target in EDH, which isn't a problem, or win you the game through symmetrical effect. Most cards on the multiplayer banlist are banned due to symmetry such as
Balance,
Sundering Titan and
Recurring Nightmare/Kokusho. If you're logic is that playing OP cards is fine as long as you don't straight up win the game off them then why wouldn't the Moxen and cards like
Recall be fine? You may get a severe early game advantage but if you have 2 or more other players ganging up on you because of it then you should still lose due to inferior resources.
It just makes no sense to me why you have cards like
Painter's Servant banned, who can only kill 1 player at a time with
Grindstone for a 6 mana initial cost, when you have Auriok Salavagers/LED legal that can kill every player, if your commander is Breya, for the exact same cost. Honestly just feels like the people who make the rules for multiplayer are lazy and stopped caring about the format years ago in order to keep it as casual of a format as possible.