Upper class is a bad descriptor, and many working class people do shop there, but I think Costco does have a bit of an upscale connotation. A different one than

Upper class is a bad descriptor, and many working class people do shop there, but I think Costco does have a bit of an upscale connotation. A different one than whole foods or a natural food co-op, but I think it still has one. It's not the "normal" grocer.