Earlier quoted context omitted.
a similar store near me replaced their 2 checkouts with 5 self checkouts, and has one person nearby to help/monitor.
Funny, because our expensive store did that, but the dollar store may not have the upfront capital for it.
I think it just depends on what the net improvement is. If they had two checkouts before, that each required a person, and they replace it with 5 checkouts that now require just one person, the cost per person-checkout is 20% of what they were paying before. The machines themselves might be leased or otherwise amortized over significant periods giving a cheap cost per year. If lines of people are waiting for checkout that might mean a much improved experience.