Keep in mind [one page view != one ad view]. If you refresh the same video more than once, it does not keep repeating the advert. There is also a limit to the m

Keep in mind [one page view != one ad view]. If you refresh the same video more than once, it does not keep repeating the advert. There is also a limit to the max number of adverts shown per session to a user. Moreover not all videos have ads and not all ads are shown to all users. There is no point in showing an ad for home-depot to your European demographic, likewise there is no point in wasting ad bandwidth on a 150 view home-video.