They have become the showroom for new or high-margin tech like Oculus, Dyson, 7K refrigerators etc and they collect a hefty margin and shelf fees for the effort

They have become the showroom for new or high-margin tech like Oculus, Dyson, 7K refrigerators etc and they collect a hefty margin and shelf fees for the effort. They make more money B2B than B2C probably. On smaller stuff their markup is ridiculous ($40-50 for an iphone screen protector that you can buy in a different brand in a pack of 3 for $10 on amazon).