There is such a breadth of knowledge and experience here, and such a willingness to help and share, that many members have 'nothing to add'. Every question gets answered quickly and completely with extremely competent answers. Many folks are quiet observers. They participate by watching. They want all questions answered, but are more than willing to let a more experienced person do the answering.
As far as sharing camping or trailer experiences, I think most folks are a little more shy or a little more private and prefer to keep things to themselves. They are not so much interested in the social side. They have their friends and/or camping preferences and want to keep it that way.
I think you are all right, this forum is a cross section of society and mirrors most large groups.