How are you going to bolster customer service when the customers never get to see a live human being?
just because you don't have a counter doesn't mean you can't have a customer service person on site, the point of this argument was, that if you saved money on cashiers you can put more into customer service. But that's a POSSIBILITY, no guarantee that saved money will always be spent the way consumers want it (which is saving on purchases, or better service), although there's lots of incentive to do that (such as stay competitive, or do more business).