My friend told a few of friends to click on ads on his forums, and is earning $10 a day for ~50 clicks. WTF.

That can get him suspended from adsense. If the same people click on them again and again, google will track them and suspend his account.

Say goodbye to your account...

Adsense is such an easy way to earn $$ legitimately. It's amazing to me that lazy people still try to scam them.