I think you're misinterpreting what the OP means when he says that quote.

The way I read it, the OP was not saying that his AdSense payments would increase because he got higher bids for the ads due to higher quality content, but rather that as Google started to recognize that it was quality content, the PageRank of his site would go up, display it more prominently and generating more views and uniques.

I could be mistaken, but that interpretation seems to make a fair amount of logical sense.