I would say that there aren't a lot of people who bike tour, and on top of that, I would say that most of us are pretty much regular users of the net. I've been a regular poster on a motorsport forum in the past, but I imagine there a lots of people who have no urge to spend time typing stuff on an internet forum.
I would agree with others that for me, a forum like this is a mix of learning stuff, sharing stuff, and a bit of entertainment as well. I think mostly its just cuz its fun to discuss stuff about something that one is passionate about. I've loved riding a bike since I was a kid, and it doesnt seem to be getting less fun, so picking up tips and whatnot is nice, and i do like (hopefully) helping out beginners with stuff. I know I always appreciated tips and things from experienced riders in the past.

ps, cute fork pics btw.