I wonder if many of the other DVDs that people watch only once are largely filled with beautiful scenes but not a lot of information on the species involved? My DVDs are narrated with as much factual information as my team of researchers (me, myself and I) can ferret out. There is certainly too much to absorb in one viewing (even for me, and I wrote the scripts!).
One could look at them as reference books on each group of species rather than just a lot of "nice" video. Of course divers in other parts of the country may be less interested in what's in our kelp forests here, but I've found my best customers are some of the most "serious" divers in our waters... the ones that really want to learn about the species and ecosystems instead of just feeling the "AWE" (which isn't bad either).
One could look at them as reference books on each group of species rather than just a lot of "nice" video. Of course divers in other parts of the country may be less interested in what's in our kelp forests here, but I've found my best customers are some of the most "serious" divers in our waters... the ones that really want to learn about the species and ecosystems instead of just feeling the "AWE" (which isn't bad either).