I'm not OP, but I'd guess its because there is a really limited market for mattresses. People of course need and want them, but the turnover is (or can be) a very long time. I have a mattress in our guest bedroom that I used in college, over 20 years ago. It could probably be replaced, but will probably only get replaced with our main mattress when we replace it. It's fine for the minimal guests we have or when my wife or I sleep in it when we are sick (and don't want to keep the other awake).
So for mattresses you really can't afford low margins if you want to stay in business. I can't imagine mattress stores sell more than several mattresses a month. As for why Casper and Purple mattresses are so much when you are supposedly removing the middle-man (the physical stores), I'm not sure. Because they can? I don't really understand why someone would buy one of their mattresses that you can't test out at a store, when you can pay the same price at a store and test out all your options.
So for mattresses you really can't afford low margins if you want to stay in business. I can't imagine mattress stores sell more than several mattresses a month. As for why Casper and Purple mattresses are so much when you are supposedly removing the middle-man (the physical stores), I'm not sure. Because they can? I don't really understand why someone would buy one of their mattresses that you can't test out at a store, when you can pay the same price at a store and test out all your options.