Seriously. I'd figured they'd filter these "clicks" out easily server-side and didn't bother to install this thing, but this ban has hinted otherwise. I'll be installing it everywhere I can now.
With IPv6 it could work, or maybe with the local IP address passed by the script at click time, but the latter would be trivial to forge.
Then again maybe it doesn't, since they bothered to ban this extension. They did seemingly more-or-less give up trying to sort spam search results from low-traffic but high-value sites a few years back, so I guess they can't algorithm their way out of every abuse problem.
[EDIT] all ads on some pages visited by a given IP over some shortish span of time, I should say, in the case of NAT.