Taking care of an online community is no small task, especially on the long run. That's why you gotta be up to the challenge as a forum admin. While some us prefer to lurk in the shadow and let their forum evolve on its own, others are going to be part of the community, just like any other member.
It's pretty easy these days to start a community and make it somewhat active. But are you going to be able to keep up with it and make it happy and active for the years to come? It's likely that after the honeymoon is over, your overall behavior and presence as an admin will change. Perhaps it already has...
Which type of forum admin are you?