A Google AdWords advertiser at WebmasterWorld reports that he used to pay $0.15 per click on his ads but recently his quality score forced him to up the price of his AdWords ads to $10. He'd like to know if there's any way to recover from such a high jump.
An interesting discussion has emerged as a result of this question. Some people believe it's not possible, but it also depends on what kind of site you are hosting. If, for example, it's an ebook site, a "get rich quickly" site, comparison shopping engines, travel aggregators, or data collection sites, you're probably out of luck.
Others speak from experience: one has had 2 of 4 sites recovered from what he believes to be a quality score algorithm change. And some others believe that it impacts the entire account and that you need to fix the entire account before proceeding with the actual problematic keyword.
One person has circumvented this by migrating his data to another brand new campaign. He then waits to get slapped again with high CPCs at which point he moves to another brand new campaign.
Other suggestions speak from experience and users trying to make sense of it all. They call it AdWords Engine Optimization.
Forum discussion continues at WebmasterWorld.