Great post Harold. Lots of good points. You're absolutely right about needing organizational and individual motivators. This will help create sustainability. Maintaining sustainability in groups like these is always a challenge. Too often it falls to a few and when burnout occurs and needs aren't being met, the group tapers off. There are several niche community sites out there, including ones in Ning that start out with lots of energy but are now virtual ghost cities. The communities that I've seen that are successful constantly evolve to meet the group's needs.