Yea, that's going to continue to be the case until someone (cough us, cough) figures out that what you look at or buy on one occasion might not actually be something you're interested in. Specifically speaking of //items//, this is really a huge issue that is so huge that it's almost become laughable in the sense that nearly all the recommendations via "machine learning" (Collaborative Filtering, Trust Systems, etc) nowadays end up being so tainted that they are worthless - to you, and to the companies spitting them out. I call it "Recommendation Blindness" (copyright 2008...20% on usage...etc...etc..sue you..etc.....I'm just kidding of course).