JetBlue can charge a few bucks to watch TV but it won't happen. It's one thing that makes them unique. And, on flights to the Caribbean where the TV service is not available, movies are offered for free. JetBlue doesn't need to charge customers for every little thing. And, I love the "Blue" drink ideas!
Another idea: an inflight magazine!!!!!!

It would be a great source of revenue and a potential money-maker. The only issue I can think of is that the advertisers in the magazine are interfering with advertisers on the TV. However, the TV advertisers are really going through DirecTV...not jetBlue.