I thought the retail margin was related to (essentially) how much floor space your product takes and how often it is stolen. High-end electronics should be less than 50%. I certainly doubt that a flagship smartphone has 50% retail margin, for example.
And how often it is returned to the store because buyer didn't like it. Some things can be resold, but most of the time the seller eats up the costs. It is always amusing for me to see people being outraged by the costs and seeing nothing wrong with returning something to the store just because they can.
