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Also the statement that zombie PC clicks "are all but impossible for Google to detect" is wrong, or at least misleading. For one thing, Google don't have to detect every false click; they merely have to identify those accounts whose earnings consist primarily of clicks from zombie PCs. Especially accounts with high earnings, which are hard to disguise.
I can think of a few ways to do that, but I won't get specific for fear of helping organized crime in their efforts. One thing I will recommend, though, is that Google get a bunch of Win98 PCs and infect them with every piece of spyware they can get their hands on. Then put them on dedicated IP addresses and see which ones start mysteriously generating AdSense clicks.
Everything should be based on facts, if AS still gives the best ROI in the market, who scares about that? Is it a real problem?
I think the zombie PC problem has peaked.
You may well be right. I was commenting on a possible reason for poor payment per click in the last few days. In the long run things are ever changing.
Which is all a bit off topic as Google being down a bit would affect the number of impressions but not the rate of pay per click.