Tonearm - 7:35 am on Aug 8, 2012 (gmt 0)
Do keep in mind that the curve's apex is rounded, and where you are on that curve is constantly in flux. So don't get lost on debottlenecking your optimum profit point on that curve, it's a moving target - get in the sweet part, and work on the PPC foundational aspects, it's rare for your offset on that curve to be your point of largest returns for your work you'll do.
Since it's a moving target like you said, I plan to have my automated system test this indefinitely. Once the apex has been approximated, I think bids would usually move up and then back down after each test period on either side of maximum profit. If the apex moves significantly, the system will follow it and move bids up continuously or down continuously until the apex is found again and then go back to going up and down around the apex again. All automated of course. How does that sound?
What do you think of using aggregate data from my entire campaign for this instead of trying to get really granular?