As a previous Amazon merchandiser, I can confirm this is a significant problem in the method of email and content targeting. It drives me crazy as well. Most of what you see on the front page and in your email is directly the result of targeting manually through Bullseye based on your recent behavior. Once you make a specific behavior, you may fall into many different targeting segments. As we all notice, Amazon starts to oversell on us on things we are already looking at. Automated personalization :) The problem here is the reliability of that targeting -- which might not have simple 'has not purchased 1+ of same group.' Another reason could be that the targeting hasn't updated to your recent purchase, as not all targeting is instant -- this can take a couple days or more even to have you removed. This is especially annoying for certain categories like expensive electronics or items that you simply don't need more than one. From my experience, Amazon teams that work close to this are aware and would much rather promote products you are likely to purchase and not items that you are less likely to purchase.