I love great TV.
There are countless well-crafted shows on the networks and on cable right now. However, it can't remember the last time I watched a full television season or even watched a show on TV. What is wrong with me?
I am interested in the topics and recognize the entertainment value, but at some point during the last 10 years, my life has become so busy and my priorities have changed so much that I never catch shows on TV.
Chances are that the target audience for your online community behaves the same way. You could provide the most valuable content, connections, and discussions in your community, but you are still competing with a multitude of personal, work, and online priorities.