I work for a website that sees on average about 30 million page views every month. We have been monetizing our pages with some success by utilizing some ad networks including Context Web, Intercept Interactive, Blue Lithium - among others. One thing that we've noticed, however, is that the take rate for the impressions we're sending them can at times be horribly low (20-30%) and even in good months around 50-55%. What can others tell me about what kind of a take rate your networks have given you on the impressions you're sending them? What percent of your impressions do they passback to you? Does anyone know what the industry average is for percent of passback impressions?