I don't think they'll ever offer it.
They certainly would have had the technology and knowledge to know that would have been a feature that people desired.
However, they don't want us to know how much money we're making per click. They won't even tell you what percentage (or whatever formula they use) they pay on each click. This is very secretive stuff. LOL.
On that note...do you think that if you have a higher click-through rate, you get paid more? I had the ads on my message boards for a while. I had tons of impressions, but not so many clicks. I imagine because the repeat visitors were desensitized to the ads and had better things to do like posting messages. I found my earnings went down a bit when I had them on the forums...not sure if it was coincidence.
Alice