Hi. A couple things:
Yes, I'm not the most active person on the forums, but I do keep an eye on things and when there's a major problem, I'm pretty good about responding. I imagine that anyone who's ever contacted me on Twitter about a serious technical problem on the site saw action pretty quickly. Just because you don't see me posting a lot doesn't necessarily mean I'm not around. And I do sometimes participate in threads as well, so it's not as if I'm a complete ghost on the forums.
Also, the Flat Earth Society is more than just the forums. Adding materials to the library, email correspondence, memberships, the podcast, occasional batches of t-shirts, etc are also part of the job and you'd be surprised how much time a lot of that stuff takes. And then there's background maintenance stuff that generally doesn't get noticed but would get noticed if it wasn't happening.
I know there was a period where, as Wilmore correctly pointed out, I wasn't very involved with the Society and it suffered a bit because of that. But that was quite a while ago and certainly isn't the case now.