Hopefully someone can enlighten me on something that I'm confused about it. So when it comes to CPM, from an advertisers point-of-view, they pay for every 1,000 impressions of their ad. Now their ad is viewed on multiple sites. So let's say it's viewed 100 times on Site A, 200 times on site B, 300 times on site C, and 400 times on site D. Once that happens, the advertiser pays. Correct me if I'm wrong, but that is how that works?
From the perspective of a publisher is where I'm more confused. So if I'm displaying CPM ads on my site, am I paid everytime the ad is viewed on my site or does the ad have to be displayed 1,000 times on my site before I get paid?