jkwilson78 - 9:05 pm on May 1, 2012 (gmt 0)

If you have to change an ad every 30 days to keep it in "rotation" doesn't that in effect kill the "history" for that ad? Without the history wouldn't you lose any benefit (reduced CPC) an ad might have gained?

So in effect in order to keep ads rotating you will pretty much need to be constantly adding new ads with no history resulting in higher CPC or stick with the ads you have and don't test and potential pay to have an ad that shows more often becasue it gets more clicks not necessarily convert better.