Ten minutes late for an eye appointment and they would not see me. They lost a customer for life.
The worst part is that they could not have cared less. I went to an optometrist closer to home and I got treated like gold. Someone else was late and they were seen, and I waited a couple of minutes. No big deal.
Remember at Costco you are just a number, which is why they assign you one.
I know that the optometrists do not work for Costco, but they are associated with the store chain, and they have to live up to the Costco standards of customer service.