The very strange habits of Amazon shoppers

I just added D.G. Hart's From Billy Graham to Sarah Palin to my Amazon wishlist. When I did so, Amazon informed me "Customers buy this book with He Stopped Loving Her Today: George Jones, Billy Sherrill, and the Pretty-Much Totally True Story of the Making of the Greatest Country Record of All Time by Jack Isenhour."

Customers? Plural? Really?

Thing is, I find myself interested in both titles.