Google AdWords Traffic Estimator is Very Buggy
There are at least two instances where the Google AdWords Traffic Estimator provided estimates that could not possibly be correct, and were off by a very significant amount.
In one case bidding 0.05 resulting in a top 1-3 position, keeping everything else the same and raising the bid amount to 0.10 resulting in a 5-6 position.
In another instance restricting the geographic area to a 30 mile radius of Los Gatos California (thus defining Silicon Valley) derived the same cost per day as an unrestricted global whole Earth coverage.
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