what will happen if visitors clicking on ads but they dont buy from the advertisers because its not our mistake if they are not intersting to buy somethink
Basicly thats not your problem because you get paid per click not per sale.... just dont break any googles rules and you will be fine.
Yeppers. That's why it'll do no good to "trick" your visitors into clicking. Maybe that worked years ago (before smartpricing), but now it'll kill your earnings. Before you know it you'll be making < 0.01 per click.
Well..not all advertisers are looking for purchases. Some of them are just happy spreading the word about their site.