One reason why otaku buy shows from certain stores are the bonuses that the stores give when you purchase 1, 3, or all volumes of a show. I've made a
list of all the store bonuses, but I wanted to bring attention to the newly drawn boxes from Animate, Gamers, HMV, and Tsutaya:
(Clockwise from top left: Gamers, HMV, Tsutaya, Animate)