Yes, vending machines require attendants. That is common knowledge, youre welcome for supplying it to you.
However since these arent redbox machines, the companies or people investing in them will want to make sure theyre taken care of. And if theyre selling stuff from them, they will need to be refilled eventually and nobody has made the vending machine refill android yet, so a human attendant is necessary no matter what machine.
Plus, selling alcohol from them will require complying with the dram laws you keep saying make it impossible for them to exist.
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