The volume linked above costs $329.99 US (about $390.00 AUS). It is 360 pages, so not too short, but nonetheless very, very expensive. Apparently it is print-on-demand.
So if I had a PDF of the book and wanted to publish it using this technology, how much would it cost me? For a base-level I went to Blurb. Assuming I can produce it in black and white (seems reasonable given the subject matter), and if I want a hardback and a small size (13cm × 20cm), this book would cost $29.95, and that’s without any volume discounts!
Now certainly there are costs associated with editing a book, getting ISBN sorted, and other matters that aren’t included in the Blurb cost, but nonetheless, it seems entirely unjustifiable for OUP to price any volume as they have.
Perhaps the solution is for authors to stop submitting manuscripts to such publishers. It is pretty certain that most individual buyers cannot afford to but such books. Thankfully there are publishers such as Eisenbrauns who produce good quality books at good quality prices!