fascinating article i wonder how acurate it is. To be honest the traffic estimator's that google has can never acurately predict CPC perfectly, but i do agree that it is fustrating. However we also have to remember that most of the time it's market forces that decide the cost per click that that this can vary from day to day depending upon how much competition there is for keywords.
Sorry I just posted a comment on the wrong thread so i thought i'd respond more appropriately this time. You never get warnings from Google, just get instantly banned.
i guess the question has been answered, after ur banned u will get a message you were banned contact so and so
Yes, you will receive an email saying that you have invalid clicks. In the same email, they say they banned already.