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I'm 100% that this goes against their TOS, but can't find the part that mentions this.
Can someone confirm this is not allowed and is a very bad idea?
I sometimes do wonder whether unleashing Adsense to a hungry horde of SEOs who immediately start thinking of ways to game the system is that sensible! (... joke guys!...)
Reality is it's easier to monitor adsense publishers than all pages on the web due to size reasons as well as all the info they have on you from their code. Read the TOS, this isn't amateur SEO hour.