Thanks. I can’t help but conclude that the public outcry is exaggerated – the books being bought are evidently selected at random. The chances of the companies buying some particularly rare (and more expensive) book this way seem slim, since they probably don’t want to waste too much money.

Perhaps.

What I actually want to know is the rarity of the books in question.

So, what is the book that they tracked? What other books were in the order alongside it?