> Costco doesn't have a wide selection because the idea is Costco only sells good stuff.
This is where you get deeper into Wall-E territory. A lot of their "good stuff" is junk food. And a lot of people eat more of it when it's lying around their houses. And really it's only "good stuff" because it's brand name. There are better tasting chocolate bars with less packaging than Hershey's Nuggets.