I think the only reason it sold in that range is due to it being rolled (not that I have an ounce of interest in it really)...
Inserts are usually rolled, surely it would be harder to find a folded one, especially something as new as this.
I've had the rolled one sheet, same art for years and nobody wants it at a much lower price,mans a rolled one sheet would be much harder and usually much more sought after.
Some people are nuts, and in this case at least two people are nuts.