First of all, because of a brand effect, is it not worthwhile to spend three or even five times more on a thing of the same quality 10 times? Unless you are extremely rich, anyone will do the bill.

Secondly, why are counters expensive? Because of store fees, advertising fees, franchise fees, celebrity endorsement fees, employee salaries, company operations, etc. These add up to a mountain. Maybe the counter doesn't make much money, but it's really expensive, especially big-name luxury goods.

It sells well because it's really good and decent.