It's a wiki, not a forum. There is a little activity because it's generally used only for reference. It will grow with time, don't worry. For the time being, I see lots of pages with only one to two lines - A healthy wiki is one whose pages are fleshed out :)
I know that there are several pages with little content, but I hoped that other people will feel easier motivated to add something, due to the lack of content. If many see that most of a page is already done, then they will likely find it hard to add something new.