Good question. It's definitely not a reprint in the classic sense of the term, in that it isn't an exact replica of the earlier card. It just uses the same image as the original PC and cabinet, and all evidence seems to it being issued much, much later.
It's worth what someone will pay for it. And in this case at least two bidders really wanted it. Of course, the question is did they get all amped up because of subject matter; or because of the original postcard showing the same image; or even because of the prices this card has realized before when sold in big auctions without the other Idaho postcards readily reviewable by clicking "see other items" form the same seller.
Here's an example of an early real photo postcard reproducing a famous photograph from the 1880s. What's it worth? Who knows? But if the purchaser of yesterday's Walter Johnson is interested, it will happily be available
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