Dupe might affect the seller, but customer doesn't care much. In the past, people had to go by brand name as an assurance of quality. We have other means now. Reviews from other buyers, detailed specifications, return policies - all reduced the moat of branding. People can now buy any brand that has specifications they want, use reviews for quality assurance and it's easy to return the product if required. Brand is not playing the same role it used to.