Why do you need a high-volume of traffic is my first questions? If you are running a media company and need more views for advertising purposes than wanting low CPC is a good goal. However, if you are selling a product or service the CPC doesn't matter as much as the ROI you are receiving from advertising. I have been able to generate CPC's as low as $0.02 on Facebook going after a highly targeted hiking niche. However, you need to have a good niche with a decent size to generate that low of CPC on Facebook.