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Google certainly wouldn't want what you've done to become a widespread practice.
Since Panda, all I have seen over my 100+ websites and the hundreds more I work with is increased Google Ad spend and increase in spam/MFA rankings.
Recommendations Publisher Insights
Replace your 468x60 ad units with 728x90 units 75%-110% predicted increase in earnings.
It's the bottom line that connects. Financial targets.
Who Believes There is Still "No Link" Betweeen G Depts?
That was the main reason that Matt Cutts first started posting in webmaster forums.
Creating massive paranoia in the publisher community pollutes the web with publishers trying to diversify every which way
there is a rather incestuous relationship