snoopy1122 - 1:45 am on Oct 4, 2011 (gmt 0)
Why expect the CPC to change for the same ad?
You should see a change in QS unless both ads have the same one. I doubt that's the case since one ad is so much superior to the other, unless your QS was 10 to begin with.
Because I think the high CTR ad is subsidizing the lower CTR ad in terms of quality score.
Only a few days in but the CPC of the lower CTR ad has jumped quite a lot after suspending the high CTR ad, from 30 cents to 39 cents.