The high visibility of your book translates to higher sales, and more profit not just for the bookstore selling your book but you as well. (publishdrive.com)
You're hoping and expecting some of the people who enter your giveaway to put it on their «to - read» shelf, which enhances the general visibility of your book. (castlegatepress.com)
On a different note: It seems (to me) as if all this fear mongering (not this specific article, which was very informative) is a way to get people to withdraw their books from KU, and thus increase visibility of the books who remain. (blog.yourfirst10kreaders.com)