Could be his riddle site. When you click to show an answer to a riddle the link is "<a href="javascript :void(0)" onclick="Answer(960); return false;">" and of course the answer shows without a page view.
On that particular site I think your CPM would explode if you changed it.
Here's what I would do. "Break" the Ajax for 3-4 days, and see what happens. By break I mean, change it. If anyone asks you, it's "temporarily not working". Does your traffic drop? Did your earnings increase?
It'd be worth the test before you make any major changes, and of course the advantage is that if your traffic plummets, you can just "fix" the site. 
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