Google is frequently robbing people of their money. All a person has to do Is go to your enemies website and click ten to twenty times on his google adsese ads And his account will be terminated. I earned 89$ when my account got suspended and it was done in by my friend who tried to get more income by it. Google didnt listen to any of my Plea and didnt return the account. SO i recommend to use Bidvertiser and Ad-brite.
This may be late but google checks on what IP range you login with your Adsense account. It also leaves cookies and other stuffs on your computer that tracks the owner that Adsense account. They won't block you because someone is clicking your ads way too much but they will block on different aspects.
They do investigate before blocking an account, the first step they do is to reduce the quality of ads being sent to you then block your account entirely. After being proven guilty, you will be banned from the service and your website that serves Adsense ads will start to get advertising again and this time, no clicks are being counted and no money gets paid.
How do I confirmed this? I have at least 30 Adsense user friends and one of them even earn $1000 a Month, from time to time there are greedy competitors that wants them out and they clicked his ads.
Before anyone will try to trick google by using proxies:
1. all clicks from public proxies are not being counted.
2. even if you change your IP, there are still other methods to track who you are. you only made it harder to trace but you are traceable.
3. you need at least 1 min to get the click counted, ideally 30secs was enough.