I am not sure how GOOG weighs what happens after you click on a result, it would be clever of them to notice how quickly you click on another result for the same search and slightly downgrade the first link (though, what happens if you open the first three links into new tabs before you actually visit them, say). My assumption was that they just counted clicks as an upvote, so if these scammers can make it into the first page of results, they will tend to stay.