You're using the wrong definition (and truncating it to boot) for "commodity" here. The key element is the "undifferentiated" element, and, while there's room to debate the true level of differentiation of mass-manufactured products to which a brand label is applied, the point is that what sets Luis Vuitton, Gucci, Prada, etc., apart in the marketplace is in fact a perceived differentiation in quality from products not- or differently-branded.

I thought you got unfairly slammed for your Apple comments, but you're really pursuing a barren ground here.