Some relatively limited run books, certainly aimed at the plastic modelling world do command some very high prices once out of print - Duel in the Mist Vol 1 springs to mind - a fifty pound book on first release and now fetches an excessive price in comparison if one comes up.
That said I have seen as above some highly inflated prices for some for which there must be a good reason and the listing explanation seems a viable one given the article (book) concerned.
So, my copy of Malcolm Darches book will sit on the shelf until I slip off the old perch and then perhaps somone will make a killing