People are not angry because of this specific ability to buy bank boosters but they see the slow but steady increases in rwt. The advantages that however slight are being compounded with ever increasing releases of more rwt. A lot of players have junk in their bank me included. If I was really efficient I would not have kept the sof rewards, different varieties of pets, items to do lv 3 treasure trails which I don't do anymore and so on. Even so I still have a dozen space for more junk. So bank boosters are not really needed for most players.