Participation in Google AdSense has NO IMPACT on Google Search. This is very clearly stated by Google so if there were a cause and effect relationship between participating in AdSense and one's performance in Google's search results, Gooogle would be guilty of fraud and the implications for Google from a legal standpoint would be disasterous for Google. In addition any quid pro quo related to one's participation in AdSense and one's standing in Google's search results could be a basis for anti-trust investigations.
The problem with the Google sandbox theory is that everybody blames the performance of a new site on being sandboxed by Google. While Google doesn't call it a sandbox, my understanding is that they only penalize new sites IF they trip off some of Google's triggers for detecting spam (e.g. building links too quickly).
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