Look, I've worked in search at Google for over 5 years. I know all of the signals that determine how results are ranked and most of the details about how they are used. I know all of the metrics that are used to evaluate and tune ranking. I know nearly everyone who works in ranking, and I've seen a decent fraction of the launch decisions and the metrics supporting them.
I'm telling you, with no caveats, that we don't make ranking decisions based on statistics related to revenue. If that doesn't convince you, then I don't know what would.
I think of it as additional information Google supplies, I don't think of it as part of the search results.
I liked the old Google better. Today DDG has the simpler interface and gives me 50% more search results to choose from. Google looks more like the old Yahoo or Netscape portal every day.