Have you ever wonder why your ad gets so many impressions and you get so little click thru? Well here is why your ad is shown on the same page to the same person multiple times. I have noticed this before but never really pay attention to it since it was only 2 impressions at a time but now I just found one shown 4 times that could of gone to 3 other people that might of had purchased your product or at least have gone to your site...