If I watch something at prime-time on a commercial tv network, how much do ads cost? Then, divide this by the audience, how much is the advertiser paying to reach me, as an individual?
Second question: What is the advertising revenue for a whole season? Deduct the cost of the season of shows to buy, divide by the audience (in number of individuals). How much does the network earn from me watching their show?
Third question: After production, marketing and other costs, and given the show is already a sunk cost, how much of a show season on DVD is profit?