Really Amazon?

So I my last two purchases on Amazon.com were a Webber BBQ Grill and a color printer for Dup's Macbook and Amazon is telling me that they have a some recommended reading for me...

Was it the Barbeque or the printer that led them to this assumption or would the combination of those two items lead them to think that I would benefit from the pearls of wisdom that lie between the pages of this book?

I bought it of course.