[jerlam]

Yes, it's the same reason that I recommend people just buy stuff from Costco if they have the item.

A buyer at Best Buy or Costco explicitly made a decision to stock the item at the store/warehouse, where shelf space is not free. If that item has a lot of returns or complaints, the store will stop selling the product. It takes up space where a better product could be, and returns waste the time of employees.

Amazon doesn't have these controls. Listing an item on Amazon is cheap and Amazon has no incentive to prune their marketplace of junk. The only controls on Amazon are user reviews which can be gamed.