wordtracker & meta-search engine "click throughs"

[Makaveli2007]

I know wordtracker gets their data from meta search engines, etc.. However I just read they got it from "meta search engine click throughs".

I also know that only about half of all users even click on a search result (if one can trust the infamous AOL data leak..). Does wordtracker really just count meta-engine "click throughs"?

Im just curious, because that would be yet another reason for the difference between overture's numbers and wordtracker's numbers.

P.S.: I know that won't change much, but Im still curious about it ;)