RhinoFish - 1:47 pm on Feb 8, 2010 (gmt 0)
the relationship sort of "works" in reverse...
it's not how high you get that improves (or degrades) your CR (I agree, there's no direct correlation), but rather how high you get your CR allows you to move up higher.
the move up comes from two sources - more profit to pump back into bids, plus better metrics that will reflect in your quality scores.
improving your ctr gets you eyes (and a bigger ppc spend) - doing that with a relatively poor CR just gets you into deeper trouble.