I am learning this is something of an odd and idiosyncratic world. Coming from my collecting history perspective, concept art and originals would command a premium, but it doesn't seem to work that way really. Oddly, many of the 3D props I find to be rather cheap looking and of course there are tremendous issues with conservation and display. As much as I like some of the costumes, to display such a thing on a mannequin wouldn't really work for me. But then I don't get a storyboard copy "used in the film" really being of such interest either. Also, it only takes a few minutes of browsing prop collecting boards to come away with a healthy dose of skepticism for the authenticity of some of these items. For example, a production clapperboard is often matched to "behind the scenes" photos to establish authenticity. But if you can see said idiosyncratic damage and wear in the photograph what's to prevent someone else from doing the same and faking it. The entire concept of screen matched seems somewhat dubious as a result. Concept art, however, I would venture to say that much of this has not seen the light of day before its offering.