"We kind of expected this from our audience," Peristere said. "We did so well on [Amazon.com] with the Firefly box set and the performance of that helped us get the movie made. We wish the audience would get up and go to the theater, but it shows that they like to keep coming back and revisiting the world Joss created."
[...]
Whedon and his crew are waiting to see how well the DVD numbers go before proceeding with a Serenity sequel