Well, that might not be true as well. Sometimes you just want to to check information from more than one source or the result is correct but you want more on that topic and hope to find it in the next results etc. For example, you search for a technical term and (naturally) the first result is a definition in Wiki, but you already know the basics and want a deeper knowledge so you just skip to next results instead. It would not be fair to penalise Wiki for that.