Scurramunga - 6:38 am on May 28, 2008 (gmt 0)

it seems, that there are operators who buy clicks as cheap as possible to convert them into better paid clicks on their own sites.

I agree. Those 1 cent clicks are diverting your traffic to another site that has better paying ads on it and in all probability, that site is likely to be of an inferior quality.

Weed out the scum and reduce the number of ad units on your pages/site.