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On a side related note:
The least amount of code is best, in my book.
I dropped the ad tracking code after getting the data I wanted.
There are page trackers that you can put on your page that will tell you which ad was clicked. Don't let anyone tell you that there is no way to know. There are ways to know. Do a search for page trackers and look for one that tells you what was clicked on when the person leaves your page. I have one on many of my pages that tells me which ad was clicked. So it is possible to know. I do it all the time.
When you get one click on a channel you can then find out what the ad was paying.
I have one ad block running on a page, I have a channel set up for that one ad block, I can see which ad was clicked on, and if I get one click on that channel then I can know what the ad was paying for that click.
I find this very useful. My only wish is to be able to track how much the click was worth.
You can see what one click is worth by your channel data. Then you can see which ad was clicked by tracker code on your web page. By using both forms of data collection you can know what ads are worth when they are clicked.