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there's no way to tell for certain
Are you thinking it will tell you how much less than your max. bid you had to pay?
I'm having the worsed July ever... despite the fact that my traffic is at an all time high.
Sometimes higher traffic levels can bring in less focused users.
I've run AdWords campaigns before on the AdSense network and a $0.25 bid may only cost me $0.05 on some sites, so you know you're being smart priced to the extreme when a click is only worth $0.05 on your site.
Are we assuming that all clicks are smartpriced at the same rate? Don't you suppose there could be degrees?
I think you have to stick to the bottom line