Law of unintended consequences?

Cameo explains what happens when prefetch and sponsored links meet:

So- for my friends that automatically accept cookies- you are now downloading a page and a cookie nearly every time you use google and firefox together.

Another question- When I prefetch a sponsored link- does google charge for that as a 'click through?'

I wonder if google will see a change in click-through rate by browser. I wonder also if people with high hits on Google for otehr words will see a lot of spurious referrals.