I just watched the entire series and the movie, and I have one odd question.
How long do you think the Reavers can last?
They don't reproduce naturally, and it seems as if much of what the Reavers do will cause thier numbers to dwindle (living in unsafe ships, malnutrition from lack of food, combat casualties, etc. etc.)
It seems as if the Reavers sole means of keeping thier numbers is through converting, either torturing the people they capture into becoming one, or exposing them to the Pax. (Although I think it's possible they are intertwined somehow)