I've always found Costco to be an odd store. Primarily, because they charge people to shop there. I find it hard to comprehend that they think requiring a membership to enter the store is good for sales. Wouldn't they get a greater number of people checking them out and potentially making purchases if they didn't have to buy memberships?
But in any case, I received a Costco gift card for Christmas which provided me an opportunity to experience the full Costco shopping experience last week, since using a gift card is one way you can actually get in without a membership or using someone else's. And it definitely was a weird experience.