Re: Discovered something disturbing about "secondary market" in my are
The other thing worth noting: many second hand bookshops are now represented on Amazon, and they often adjust the prices of ST novels they stock to take account of the sliding demand for certain titles. Any bargains and rarities on their shelves get snapped up via online buyers, who can browse by genre, by author, by title, and from any country in the world, whereas in the shop, it's sometimes hit 'n' miss.
A shop near me closed about 18 months ago when its owner died, but where he may have priced every ST novel at a flat $3.00-$5.00 a decade or two ago, in more recent times he'd become very price savvy - and would set
huge prices on secondhand "harder to get" titles, such as "Mission: Gamma". I'd watch people arguing with him: "All your ST books should be the same price!"
In the early 80s, many second hand bookshops were more usually "book exchanges" and they used to boast that "Mills & Boon", "Agatha Christie" and paperback science fiction novels were their high turnover items. But the idea was to
encourage people to bring them back, so they could sell them again and again and again. One shop near me had to
ration their Agatha Christies! The sign on the shelf said, "Return an Agatha to buy an Agatha!"
I also recall during the 20th anniversary of ST, when Bantam Spectra repackaged the Blish TOS adaptations into three chunky, illustrated volumes with new intros (plus there was a re-release of the Mudd stories), many fans
replaced their old twelve volume sets - and glutted the market by selling off their old copies. ST IV and TNG brought in a huge number of new fans, but that peak in fandom is long passed. Stores started to turn away Blishes, which used to have a very high turnover.
I well remember when the shops began to get very selective on what they bought. People would come in with a huge grocery bag of books and you'd see their smiles droop as most books in the bag would be rejected. Paperback SF was no longer considered a must-stock.
In my (and their) defense, Therin, we weren't doing it out of some desire to hurt the used book market, but from a perceived lack of value for money in the books themselves.
Which is why I find it ironic.

You spoke with your wallet, as is your right, and the market responded. As it always will.