Because people are paying it and expecting to pay for it(at this point). You are not paying the fair price anyway. People have done the marketing research and know what they can ask for their product. And you are paying the price that generates the most profit, in theory. Apparently your brand has figured out that keeping the prices flat over the range of their products is the best way to do this.
Holland & Barett (the first hit google gave me) apparently does not agree though, because their pill prices go all over the place.
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