[jgalt212]

I guess, but you must also consider the upside as well. A human cashier is not just a cashier, but an ad-hoc customer service rep, security guard, market intel gatherer, etc.

[Chris2048]

I guess this is the "human touch" argument, whether this actually applies varies; but for "market intel" machines are way better at gathering information.

[jgalt212]

machines are best at monitoring what other machines are up to. you need to do both.