According to Google, 1000 impressions on average will net 10 clicks on a top spot in their Adwords scheme. A top position in organic results will net you 20 clicks per 1000 impressions. Being at the top of both will net an astounding 60 clicks.
Now I don't know about you folks, but I know the difference between 1-2% and 6% when it comes time to deliver reports to clients. This is an absolutely huge piece of information.
So what Google is saying is that you can double your traffic by being at the top of paid and organic results. And they didn't just say it, they sent me a graph in case I didn't believe their sales rep. Here it is;