You are correct that it requires less material. However, the $10 premium is due to shell cordovan which costs significantly more than regular cowhide.
My default single-pass straps are all made from shell cordovan. Since its only a single layer of leather, I intentionally picked shell cordovan for its firm/dense profile.
With that being said, there is no price premium if one prefers a single-pass strap made from cowhide.
I hope this somewhat helps to explain the difference in prices. Please let me know if anyone has more questions!
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