I use Google AdSense I believe you only earn money when your visitor click on the link.  I so far have never clicked on a single one, not because I consciously avoid clicking, just because they never appeared interesting to me in the first place and I skip it.   

I think this probably pays something for these people to continue this effort. I do not think it is paying them to buy sports cars or villas. so let is cool off on that and stay focused to bring the Smart phone data rates down