I love this Amazon feature. You get a sense of the broader community of books that individual titles inhabit. I’ve looked at this feature a couple of times on my own book’s Amazon page. The best example that I’ve found is the Kennedy Brothers classic paean to the Lost Cause, The South Was Right (Pelican Press). You can probably predict the family of books that have been purchased in addition to The South Was Right as well as the assumptions being made about how to understand the cause, evolution and consequences of the Civil War.