mimmo - 11:35 am on Mar 3, 2007 (gmt 0)

Such clicks can be manufactured quite easily by botnets operated over a large distribution of IP addresses, user agents, language types, etc. They can also be generated by humans operating under similar instructions as the botnets.

Yes, I guess it is not that difficult to generate clicks which are not detectable as fraud: different IP, no cookies, no javascript.

But this type of fraud would only apply to the content network wouldn't it?

If Google will finally allow advertisers to select and limit which content network websites you want your ads to run on, advertisers would have the ability to stop those websites that do not generate revenues.

Two websites, both convert at 10%. I do not care if the other 90% is fraud, invalid clicks or uninterested customers. What I care is the 10% conversion rate. To the extreme, if a website brings me 10 customers and artificially creates 90 extra clicks, I am fine with that as far as my ROI for that website is what I want.
I guess I am asking for as much control and transparency as possible, so I can take my own decisions.
Right now I do not think the content network is transparent and controllable enough.