I'm so mad about this I came back to WebmasterWorld after a really long absence! This is a pure money grab by Google. As eWhisper said, it'll now be impossible to do small account or long tail testing without a lot of extra work. We already have the option to choose "optimize for clicks" and "optimize for conversions" - there was no reason to force us into either of these options! We choose Rotate for a reason - please let us do it!