Well that's a question we may start to ask, Why?
Google has a very strict policy with how their ads should be displayed and what things every advertiser should follow.
Though you may find tutorials abundant, teaching you to using different tactics to get more ad clicks and increase your income, but do you aspire to lose your income before you get anything in return.
The worst and by foremost deciding factor on getting yourself from blocked Google Adsense is false clicking or a more known term called fraud clicks where in either you or someone for you keeps on clicking on your ads to increase your revenue.
Mind you Google is not a fool, with the amount of algorithms they have for each search term, they have the algorithm to maintain and see which partner site is getting more clicks and how and what to determine what is legal and illegal.
This is the most important factor one should refrain from and be careful from that is self clicking of your own advertisments.
Now refraining is one part, how do you be careful from it?
Well don't worry there is a software called Adlogger an open source adsense tracker which I came to know from Thilak's site which helps you track your ad clicks from which page your ads were clicked, which user clicked it, at what time the ad was clicked and much more, I too got to know it from my friend Thilak's Site from another friend John.
As soon as you start seeing some weird clicks going on, immediately report it to the Google Adsense support about the same.
Google Adsense is one of the most profitable partnership for a site and one that is brings contextual ads to the website and you wouldn't want lose a nice advertising partner would you.
Google Adsense also displays contextual advertisements which are specific to the content, I have tried various other advertising websites and the ads shown are not even related to what the articles are about.
Though there have been tall claims from people that you can get the biggest earning by following the trends mind you those trends are not too realistic at times, though I have not read those books ( I have checked their sites out of curiosity and really if you earn that much you can surely afford to get a better designer for your sites )
So stay safe rather than lose the biggest ad click payer for your site.