Gail Berman, former Fox Entertainment president, says poor numbers are the reason as to why Firefly was cancelled. Berman says the show was very expensive to make and the lack of viewers it received made it impossible to continue making episodes. She loved the show and was very upset with having to make the decision to axe it. 
Some television experts believe it was actually a good thing the show was cancelled. They say if it had continued on, the storyline would have become ridiculous and would have ruined the whole feeling of the series.