At the risk of making myself unpopular, I am going to say it is guided by the same ‘logic’ as the Atlantean Sword and Royal Armor pre-order bonuses. Exclusivity. Some members like the thought of having something that others do not, and become triggered by the prospect of the wider community having ownership of the item too. It is the same sort of mindset that pervades hollywood and certain affluent people. It is not enough to be happy that they have and enjoy the item, they have to then go out of their way to make sure no one else can obtain it at a later date. This is underpinned by selfishness and posessiveness.