I don't think this is really an issue, but even if you do it's trivially solvable. Vending machines have [somewhat surprisingly] been around for hundreds of yea

I don't think this is really an issue, but even if you do it's trivially solvable. Vending machines have [somewhat surprisingly] been around for hundreds of years. Single slot generic items, like generic tickets, could easily be 'automated' by a vending machine. Few to no places do this because it's not a meaningful bottle-neck or labor issue.