Cataloguing away busily, I checked the price on one of my books. Up came something else I don't actually have in stock at the moment: Riding with Reka, by Heather, now safely out of copyright, and therefore grist to the mill of the Print on Demand merchants. You are asked to cough up a minimum of £20 for this title on Abe, and one seller, whose honesty I suppose is admirable, says in their description:
This book may have imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process
but they're still going to sell it, imperfections and all. Obviously no one at any part of the process cares enough to check what's produced.