yes you can pool but you cannot share what you get, f.e. potions aren't transferable, so you cannot share them with the member of your pool. So one have the potions to open all packs and other have packs without potions.
Also it is a question of trust to make a pool as in the end the account-owner can just keep all and sent you nothing.
So I think it would be much easier to just allow to buy small packages.