Digital doesn't actually cost less. The rental price of a camera like the Genesis is way more than a Panaflex to start. Okay so you save on film stock and developing--but you have to have an HD tech on set at all times, sometimes more than one, and you are paying these guys over $30 an hour. Plus, your DP has to take more time in his lighting, so you will have 100 people standing around at scale wage for an extra hour a day, and then you will have post-production costs involving transfering from the HD tapes. In the end, maybe its cheaper, but just barely, and when you are spending $30 million for a run-of-the-mill movie and $200 million for a blockbuster movie what the hell is a measely $50,000 when it makes the whole film look so much nicer?