Sadly it might be the size of the fanbase. With Trek you can find a group of devoted fans in any city who will put time toward the effort(s). With TOS BSG we're fewer and a bit more spread out. There have been attempts to group together, but they seem to fall apart along the ways.
For myself I've decided to take on projects that I know I can pull off myself, and get them completed for better or worse. The latest thing I did was an animated fanfilm based on the younger days of Adama and Tigh. You can see it at
http://www.youtube.com/battlestar1999
Also, being a smaller fan base means fewer eyes are going to be checking out the work. Anything I've done has been for my own enjoyment of the series, but it would be nice to get more people seeing it, and hear their feedback, good and bad.