Costco has one of the most generous return policies in the business. And unfortunately, people take advantage of it. Which is too bad, as I am sure they are going to have to rethink their policies sooner or later.
Last fall, I was at the checkout counter and piled on several flat-bed carts were about 10 tents. They were obviously very well used as you could see the mud on them and they were faded. My checker and bagger were discussing how outrageous that return was.
Apparently, the boy scouts (and yes, they emphasized it was the boy scouts and not another scouting troop) bought the tents in the spring. They used them all summer and then returned them in the fall when they were done
The only thing I buy with the intent of returning are my cell phones at Costco. And that is only because the Sprint people have told me numerous times that the policy is designed that way. You buy your phone and then when it is time to upgrade, you bring the phone back, get a refund and get a new phone. When I bought my first phone there, the Sprint counter at Costco explained in detail that I should save the box, receipt and accessories so that I could return it in a year or two and that it did not need to be defective to do return it.
I felt SO guilty the first time I returned a phone. I called Sprint. I talked to the service desk. I talked to the Costco manager. I wanted to make sure this was ok. Everybody assured me that the phone was not how Sprint made their money - it was my contract and Sprint wanted to keep my business, so they allowed this policy. The Costco manager assured me that the return did not come out of their budget - it came from Sprint.
So that is the only thing I buy with the intent to return someday. And only because I was urged to do it by the store itself.