Serenity The Movie

What happen, no one went to see it. The movie has made only 25 million.
http://www.boxofficemojo.com/movies/?id=serenity.htm
Looks like there will be no sequel. Are the figures of a half a million plus of dvd sells for the tv series untrue? I think it should have been a mini series on the sci-fi channel. Maybe a sequel can be made for the sci-fi channel? Check this link out:
http://digg.com/movies/Serenity_breaks_$30_million_worldwide_over_weekend