As someone without little ones, my knowledge of that scene is limited.
For example, I have been in the Brooklyn Children's Museum one time. Ditto the zoo. I've never been to Music Together, shopped for a daycare or child care, preschool, or elementary school.
Despite being 44, straight and married, my life is different than many.
RE: Our readers. They constantly surprise me. Just when I assume that we don't have readers in Albany Houses or within the Orthodox neighborhood, I get a PM or I stumble upon a link to Brooklynian on one of the micro newsgroups or websites that caters almost exclusively to the area.
No, the readers are certainly do not all belong to the "blogging, starved, scared demographic" ...those demographics have just made a memorable impression on me over the years.
Very observant readers are able to realize my area of "coverage and interest" tends to be sort of circle. At the center of the circle is my apartment. The furthest ring of the circle represents points where I turned around, because the dog was looking a little tired.
On occasion, I also get quality info from contacts within the real estate industry, some non-profits, the various business districts, and government types (NYPD, Community Boards, etc) who insist on confidentiality. These readers are powerful, but (as a result of their concerns) they have chosen to not post even behind an avatar.
Once I establish that they are reliable, and they establish that I am trustworthy, I find discreetly work in their "offline" information. These connections likely make me seem smarter than I am, and I always welcome more of them.
...but as Booklaw points out, anyone can start a thread. This board is somewhat dominated by my interests by default, not intent....
I have found lots of reporters use the site for raw material, and often reach out to posters for interviews...