The problem with putting too much stock in Klout and other influence rating systems is the desire to game the system. We figure out what it takes to get a higher Klout rating and we just do more of that. Many would counter argue and say "well, don't we do a lot to game Google's Page Rank metric via various SEO techniques?" True. But Page Rank has a direct, measurable effect on where your web page appears in search results, which in turn has a measurable effect on sales/conversions. Increasing your Klout score can have no effect, theoretically.