In my honest opinion, when I was being sold Final Fantasy XIV, I see it as a game, that is the product I was sold, whether I play it only to get all the vanity items or not is irrelevant as the game wasn't sold or marketed to you that way so anything else other than access to the game and its content released in periodic patches are what I'd consider as optional.

If a player claims that he/she only plays the game for vanity and therefore being a customer, he/she should have it all, then what happens to a player who can never clear FCoB but yet yearns for a piece of armor from FCoB (for the looks) and as a paying customer with vanity as my core gameplay style, I should be able to have the item too! and as you can see, there will be no end to such an argument.