I recently read the "customer is always right" comes from Selfridge - and it's missing the other half "the customer is always right in matters of taste". As in, I might think that hat looks terrible on you, but if you wanna buy it, fine. So when people quote it, remember, it doesn't mean you have to be a doormat. It means the customer can buy whatever they want - fine - you don't have to take crap from them.