Covers all reasons. If they understood how Adsense worked, and what it means to get paid legitimately, they will know that "they won't know. I only click once a week" is really a way to get the boot. New publishers have no idea on how to act towards Adsense. They have no idea that it is one of the largest and smartest networks. If the small-time publisher was smart enough to fool Google, they wouldn't bee small time publisher first of all, but rather work for Google maybe.
So what exactly are you trying to say here?? Gotta be sure the NooB's know what you are on about...LOL
I've read in one book about Google, there are clicker treams in Far East and Russia which earn by clicking on PPC web ads (adSense). A few websites, which are using adSense, cooperate and start to click one another ads. Or they can hire an external team and share it click profit. To my mind they can also cancel competitors on the same way or they click some other sites also to moderate Google suspects. One should use adSense to get no more then 15-20% of the profit from the site. If it takes a larger stack one should drop adSense temporaly and find another ad programs.
Some people just love to blame fellow publishers. Does Adsense not make any mistake banning innocents? Is Adsense anti-fraud algorithm perfectly fool-proof? Come on!