I'm not buying them numbers, we do not know how they come by them. And how they count what is click fraud and what is not, and at first thought it looks bad.
But giving the fact many people are seeing their ads, with out them ever clicking on them. It may well be ad buyer fraud to site publishers, try running ads on TV and only paying for it, only if some one buys then.
It's not going to happen, so publishers keep getting ripped off in this way. Publishers needs to start fighting back on this, every ad served that some one sees, should get some kind of payment for it like all other ads.
We are now at the point google and yahoo is not needed, many other ad pipe lines are up and running. If publishers keep letting google and yahoo, and parking services keep taking bigger cuts. Then after a while publishers will get no cut from them, we need to stand and fight back together as publishers.