Why have they set it up so you're just under the amount to get the cheapest Myth Tome gear, i.e. accessories?

Don't you think it's a little insane that you have to wait 2 weeks to get a ring or a necklace? Why didn't they set it up so you at least can get 1 reward per week. I understand they have to pad out content by creating these arbitrary restrictions, but c'mon, 2 weeks to get 1 accessory piece is a little insane.