I'm going to agree with FiveGrand, but not for the reason that he might think.
Purchasing Google AdWords can, in theory, increase a site's PageRank. A site with sufficient content can gain inbound links from other websites whose webmasters clicked on the AdWords link, which in turn feeds the PageRank.
As far as Google "selling" ranking indirectly via the AdWords, I don't see Google doing this any time soon. However, the reason has absolutely nothing to do with ethics. The reasons have to do with paranoia, hysteria, and a recent revival in the overall competitiveness of search engines for market share.
There are far too many excessively paranoid people who make it a habit to search Google constantly just looking for examples of a singular correlation between SERPs and Adwords (among other things). These people would spread the word to everyone who would listen, who in turn would spread the word, and so on and so on in a virtual game of broken telephone until eventually some form of mass media picked up on the story and blew it even more out of proportion. As a result, Google takes a major buttkicking in terms of market share. Google, for all of its flaws, is not stupid enough to let that happen.
In other words, do what cbp said and lose the conspiracy theory.
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