Yes, it's a shame what's happened in the past while. Personally, I don't post as much as I used to because I just don't have as much time.
Although, I don't think it's just the DB that's on the decline. I've noticed participation falling on other forums I am a member of, and more and more of the posts that are there are by "showboaters" - people who just post their works in their threads, without commenting on anyone else's work and frequently not even thanking others who comment on their work.
As to the Monthly Jams in this section, I did them for the best part of six years, but they stopped being fun. They originated from a couple of impromptu Jams between about 4 of us (on the subject of Spider-man and Daredevil's respective girlfriends and/or wives) and then we made it a regular event. In the beginning, there was a friendly competitiveness to it, with a lot of banter between the participants and they'd run to sometimes 20+ pages. Again, though, it eventually became largely people just posting without commenting and it lost its spark.
It's always been my policy to post much more in others' threads than in my own, and always take time to thank those who give me comments. It's the only way to retain a "community" aspect to a forum, and I think that's what's been lost lately.
I'm going to make an effort to post more, and if others follow suit, maybe we can attempt restore the place somewhat.