in an environment where only one ad per URL will show, how can anyone OTHER than the top-ranked ad make progress toward a higher Adrank, if their ads, by definition, cannot be displayed?
of course this was the position for your competitors before. They had no way to beat you, now there obviously is a way. If anyone knows the answer they probably wont be telling.
...should scare the living hell out of anyone who thinks his/her ads are safely well-positioned on Google
I have to say I never think my ads are safe, especially affiliate urls bid to the top like this. They just arent sustainable, and Im not sure they should be sustainable just by bidding high and building clickthrough. At least now it IS possible to dislodge someone. I cant believe Im going to say this, but this maybe the new changes have merit ;) I just wish I could fathom some of the min bids.