I believe that your ads were not well designed. That is not easy to have ads which will work on google. I have used some seo firms to complete our ads for google
I believe that CPC and CPM advertising is a way of the past and will soon be phased out. It's not being used as much because there is no way to tell that the "clicks" or views are actually real people, even though google terminate wrongdoers.
CPC in my opinion is not worth the hassle, I've received better results paying $30 for 10,000 unique traffic to my site then I have with $100 CPC.