Do the publishers get paid for the ads that show their Google products? Some ads on some sites only use one ad with one banner or text link. So if they didn't get paid, then some pages would be showing ads where they will never get any credit. For example, I keep getting the same Google Analytics Version 2 ad showing up on Digitalpoint forums, now if they don't get credited for clicks on that, then it will be a huge knock on their Adsense earnings due to having just the one text ad in that unit.