I've often wondered at the economics behind Cuben from a cottage industry perspective.
The material is not cheap to buy, and I imagine it would take a little longer to assemble various goods because you simply can't afford mistakes during manufacture. And to go with the premium price tag is an expectation by the customer of perfect build quality as well, so this all takes time=money in [expensive seasonal ] labour costs. A lot of stuff is made to order so there is no "economy of scale" going on. It would be measure 6 times cut once. There can't be huge margins on this stuff so I guess we should be thankful for the dedication by these retailers.
Back to the original poster's comments, without trying to step on toes here

, the question was about tarps, but as usual it turns away from the subject and heads off on tangents like "tarptents" or tents. In my view a tarp is a piece of material with just strings around the edges, that you kind of construct your self to what is required [ie-flexibility] and everything from tarptents up are "tents" [ie-fixed].
I still say go buy $10 worth of blue poly tarp, have a play with it, sleep overnight in the backyard in it, then think about lashing out on something exxy like cuben......