They complained that they would ship their books off to reviewers who would never review the book. Probably 60% of review copies were sent unread to local libraries, handed off to the reviewers' friends, or sold on Amazon Marketplace.
The rule is - and eventually they all admit this - it doesn't matter how you get your book out there. Every copy out there is advertisement. How many times have you purchased books you loved to give as gifts to someone else? How many times did you lend a book to someone who never returned it, then buy another copy to replace it? How many people do you tell about that book?
So, my feeling is that the author is newly minted, and doesn't realize how books in the wild are helping her sales.