I find AMS advertising very confusing to work. I often forget how to toggle back and forth between sales and keywords and have to discover it again, wasting a few minutes of my time each attempt. I think they should revamp it--but I'm sure those who use it all the time would grumble over that.
Anyway, with the caveat that I've failed miserably with AMS and have completely given up with it, as far as CPC, I tend to ignore it. But you can find it along the same graph as sales & cost. When I used to use AMS, I tracked my books by bid and sales. Sales is delayed, can be in error, but it's nice that it's displayed.
I think from past posts, people always rave over Mark Dawson's AMS class. I've never personally checked it out.