Quote:
Originally posted by FlyingIguana
you have to maintain a 0.5% ctr or they drop your ads.
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And that has to be maintained for every 1000 ads served. You could have 100,000,000 ad impressions with a 5% CTR, then just get unlucky and get < 0.5% on 1000 impressions and adwords will yank your ad. Annoying as fuck.
Also, a lot of keywords have overly inflated minimum CPC's. I have found several keywords with zero bids, but $0.50 minimum CPC.