I think the premise of a "shape value" is a bit off, beauty is in the eye of the beholder and so determines subjective value (or collection value if you will).
I personally prefer classical round paperweights so I would likely not wish to pay as much for a molded or faceted one,
I am sure there are those of the opposite persuasion.
I suspect what matters to most collectors is the overall aestetic and quality, and/or rarity, of the paperweight.
I think you will find most members here reluctant to discuss dollar values as this is a board for learning about, and enjoying,
glass and paperweights, not so much valuations.