You make it sound like the type cover is some high end sophisticated device, give me a break. Its a bunch of plastic keys with cheap fabric on the outside and a glass trackpad. It costs no more than $6 to make it. Still doesnt justify the price. There is nothing special about the cover. Its thin, woohoo. Nothing new, big deal.
You are totally out of touch. Go try the keyboards available for the iPad or Android tablets. Most of them cost between $75-150, and the keys are nowhere near as good as the new type cover and they don't have a trackpad at all, never mind a better than average one that would cost at least $50 were it sold on its own.
I suppose the Surface itself isn't worth more than $100 either because it's just a sheet of metal and glass.