Actually, I don't wonder at all.
1. While every kid would love having [insert Trombone God Here] solve their problem, most aren't interested in fixing simple issues with the same platitudes. I'm sure you see it with students at your school -- a lot of us have the same problems.
2. A lot of them are REALLY busy and don't have a lot of time to spend here. Often they register and just look in to see if something interesting has popped up. Sometimes a member of their studio will drop by and post an announcement of some significant event.
3. Some of them have their own Web presence and would prefer to preside over their own turf than somebody else's. Then again, most of them aren't computer savvy or interested. Playing and teaching take preference.
I do appreciate seeing people like you here. While you may not be as well-known as Joe Alessi or Christian Lindberg, I would consider you to be professional enough.
And sorry for calling you "Bill" in another thread. I thought that's how you identified yourself to me when we played together in an ensemble a few years back.