I am on about Amazon affiliate sites. They generally tend to be review type sites with few other pages of content. I can't imagine they would rank well on Google because they are generally considered thin, affiliate sites. I have seen few examples of successful Amazon sites sold on Flippa. Couple of them generating profits running into thousands a month. Are they utilising PPC traffic. If so, can they make enough in commission from sales over and above the cost of buying the traffic?