limitup - 8:23 pm on Apr 19, 2005 (gmt 0)

I have evidence of this too and I really would like to know the answer. We changed some ads recently and our CPC went up literally 50% overnight. I posted about this and got no real responses, and I received no response from G whatsover. Like you at first I thought we had a bidding war on our hands, but we know all the top advertisers and I spoke to them all and no one raised their bids. They have no reason to lie so I could only assume it was a "problem" with G. This makes sense if that is really how it works now. Pretty crappy they don't let us advertisers know ...

You can beat a CTR of 100%.

You can't have a single ad with a 100% CTR either LOL.

Adding new ads could help your CTR under this new assumed system, just not in the first day or two. But if you had 1 ad that had a 2% CTR and you added another ad that has a 5% CTR, after the new ad has at least 1000 impressions or more I would assume it would start helping you rather than hurting.