ooo thats a good idea. I think so that you don't get people programming bots to farm the system it would require that a periodic test be given to the watching user to ensure they are at least present and paying attention. Something simple like "what was the product in the ad you just watched?" with multiple choice photo answers kinda like a captcha thing. If they get it wrong too many times the account would have to be shut down since they are obviously not holding up their end of the bargain and watching the ads.