I can't tell if the impressions are coming off Hawaii Five-O or 30 Rock. When I buy NBC, I ask for 'x' number of units, impressions in that show, or I say, 'Stay away from Law & Order SUV because of content.' Hulu can't tell me how many impressions I'm getting against a particular show. They can't tell me if what I'm buying is additive to my TV buy or duplication.