Whenever you see a site that has an average CPM of $0.00, it is because no bid was won, platform-wide, during yesterday's trafficking activity. It is important to remember that the average CPM reflects the average price of impressions that have been won through the Centro DSPÂ platform, exclusively.
There were likely people bidding on, and winning, this traffic from other DSPs, so it is not extremely accurate to judge how much traffic is worth solely on the Average CPM value alone. We normally recommend that you set a default CPM bid of $3.00 to start off with. When doing so, you can see how your campaign performs, and choose to raise or lower your bid accordingly.