I find this truly bizarre. Who are these 8%? Is there some new, widespread form of obsessive compulsive behaviour that involves clicking through EVERY link on EVERY page?
As web entrepreneurs we need to learn how to exploit these people and make as much money as possible from them. It's the right thing to do to preserve the natural selection process and ensure the proper evolution of the Homo Iunctus. /kidding
There is also the exactly opposite behavior : non-technical people who are uncomfortable with computers and scared of doing something wrong, and thus do nothing. People who don't read dialogs not because they are lazy, but because they're sure they won't understand a single word of it. They never click, never never try to fix the problem themselves (and find out there's probably no real problem) or understand what's going on.
It was a painful reality.
The point is that as soon as your service was down the ads were the more interesting content, as long as the site was up that apparently wasn't the case. I think most advertising based websites will see this effect, I'm sure that there is a way to figure out just how much 'strategic downtime' you can get away with :)
The headline should read "92% of people hardly ever click on ads". Much less surprising.