Earlier quoted context omitted.
It's good money for something accessible to almost anyone. It doesn't require much capital, doesn't seem very regulated and needs no deeply specialised skills to get started. No franchise. No middleman or supplier lock-in. No fixed rental payments. Easy to pull in friends & family labour if you need to scale, and if you miss restocking it's no biggie. Nobody yelling at you. Flexible hours. Rarely have to talk to peop…
If anything you should be surprised such a thing is profitable, it's a textbook case of "the free market should have squeezed profits to zero".
Also surprised it hasn't been feudalised somehow. Some company owning all the machines and then uber-ing out the hard work of siting them and restocking them. Gamifying the process of monitoring, "your fleet", the "ching" on your phone when someone buys a bottle of water or candy bar. Special deals for site owners. Branded supplies. An app for customers to talk to the vending machine. Loyalty points. A snack radar. Etc.
I think it's great the market is mostly independent operators.