Comment by xdfgh1112

One is low crime rate, vending machines even in major cities do not get vandalised or broken into. The other is Japan's massive focus on convenience.

I don't think lack of space is the issue. Combinis are everywhere but you'll still see vending machines in most parking lots and laundromats.

Tech advancement is also relevant. I believe Japan invented vending machines that serve hot and cold drinks simultaneously and they adjust with the seasons. They invented improved ways of loading the cans and spend a lot of effot on the design and art, there are even vending machine exclusive drinks etc.