On the pages where my clicks average at least $0.50, I sometimes get a click or two that brings in zilch -- $0.00. What are the reasons this can happen?
There are lots of ads in these niches, so I don't think it's because it's because of $0.01 advertisers.
BTW, on one page that had a $0.00 click this morning, another click came through later at $0.41. And I had a $2 click on another page earlier, too. So my account isn't smart priced, either.