This is the answer. Japan has a lot of respect for others (well, for other japanese at least), so these types of machines will last a lot longer; making the payoff more palatable.
Place a vending machine outside in America, and it’ll be vandalized in a week max.
Even in highly walkable cities, you don’t see vending machines. It has nothing to do with cars, it has to do with the culture of the US being one of disrespect most of the time.
I mean, human men have nipples and there’s no use for them there either. Evolution doesn’t get rid of things because they aren’t useful anymore, it only gets rid of things when they become detrimental to the survival of the species.