One of my ad zones has 5,758 impressions and they've only shown 521 CPM ads. This is about 90% US traffic, 5% Canadian, and the rest elsewhere. Am I doing something wrong or are they just running low on CPM ads and filling it in with the same 5-6 text ads that they always put up.
Not all adbrite ads are cpm. I've also noticed that adbrite will even show other network ads like tribalfusion, doubleclick, cpx interactive, fastclick.net, and other non-adbrite ads. So that number could indeed be right.