martinibuster - 1:40 am on Jan 7, 2011 (gmt 0)
I really have to believe that this is a software fluke on their end, which we will never hear about.
I'm confused about what is being discussed. Are you still talking about the last three days (of which it is understood is too small a data set to draw conclusions from) or have you expanded your data set? And doesn't the above quoted statement contradict what you said yesterday that your year over year Cost Per Click difference is off by mere pennies?
while the CPC in January 11 is lower than years prior, its only lower by a matter of cents.
In any case, CPC isn't the metric to obsess about. It's Earnings. ;)