In the theoretical scenario that you were banking off google's adsense using some random fraudulent method (Not something retarded like exchanging or self clicking) and you knew you can get a way with it, what would YOU use to cure adsense's CTR? Is there any cheap if not free traffic source that is adsense safe? As I am aware even some legit traffic providers put you in a danger zone.
So yeah, what cheap/free traffic source would you use to cure a CTR? and remember, this is a THEORETICAL scenario where you know you won't get banned for the clicks.