This is one of the main reasons that Amazon is my default online merchant, despite all of my reservations with them: a purchase won't increase the amount of marketing email I receive. I don't know how much spam they send to new accounts, but I must have my preferences tweaked to eliminate most of it. Contrast that to every merchant that thinks that since I bought a product from them once, they should spam me multiple times per week, oftentimes even when I've unchecked the "receive marketing emails" box.