According to one essay that I read from a Japanese economist here in Tokyo, the bigger explanation for the vending machines is a fascination or even an obsession with automation and robotics.
我從日本東京一名經濟學家的文章中,讀到了關於為什麼到處都是販賣機的最好理由就是自動化及機器人對人們有一種莫名的吸引力。