Google says that simply bidding high does not give you a higher position. The click through rate is factored in also, so someone bidding .05 could conceivably outrank someone bidding .75 if the lower bidder has maintained a higher CTR. That's a drastic example, but the bid and CTR are two items that are weighted when determining positioning. You can search for a simple description of the formula somewhere in this forum, but I believe that the CTR was given more weight than the bid. Hence it becomes possible for the lower bidder to rank higher than the more expensive bid.
It's presumed that the person with the higher CTR has a more relevant ad than the competition, but the method you cite appears to help to convince Google of one's relevancy, deserved or not.
patient2all
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