This looks like an analysis going the wrong way. Klout probably uses retweet counts as a signal in their score so it's not surprising to see Klout score being positively correlated with retweet counts at all. It does show that "Klout does work" but in a very simplistic way.

Causality: http://en.wikipedia.org/wiki/Causality

Klout scores are assuredly based on how many retweets you get.

I have a Klout score of zero and I'm proud of it. :)

Seriously, I opted out. I haven't seen a single redeeming thing from Klout. Turning social media into a game to be won or lost is the express route to removing all utility from social media. It may already be too late.