After just one episode the HBO series Boardwalk Empire has been renewed for a second season. The pilot, directed by Martin Scorsese, cost an astonishing $18 million to make and going forward the average cost per episode reportedly is $5 million. That is a high number for most hour long dramas on broadcast channels however it actually comes in quite a bit lower than HBO's own The Pacific that aired earlier this year. The investment has paid off as the show debuted to 4.8 million live viewers...