I am marketing in a niche that consumes over page worth of ads. When I first set this up, I bid .50 / click. I was at the top. It was great. I got a few sales, but .50 / click was still about as much as i'd spend Suddenly I am at the BOTTOM of the list. My quality scores are "OK". I tried to fix things up, but I am still at the bottom. I wanted to see what the top was, so I bid at 5.00 a click, and got to the top , and then saw my ads were costing about 2.50 a click. Why is this? Do you think there is any way I can get near the top at about .30 a click? How can I improve my Quality score? I realize I need good CTR, ads that match the words (via adgroups), good content, etc. etc. Also, would perry marshalls book help me with a lot of these problems?