There's already a badge for topic starters.
There is a group here already called the spartans. One of their requirement is creating new topics in different boards every week and they get some sort of reward for completing those tasks. They were active before but I don't know what happened to them now. Maybe they stopped because some of them, including their leader (I think), were reported for plagiarism.
I don't really know about the task of spartans for creating new topics regularly. But I bet, I know the leader that you mean here. However, I guess Admin will evaluate and make the spartans work on their tasks again.

I made a mistake. Not everyone has to post new topics every day. It's just if 10 % of our upper level members can create an innovative and informative post many members will get the space of sharing their thoughts. Now most of the users are commenting in the old topic just for their signature campaign.
Actually, there are many problems on the existence topics as well. There are many topics that seem almost the same. But unfortunately, we have lack new posts. So, I can understand why they were not deleted yet.
Regarding to most users comment on old topics, I think we cannot blame them. It is happened because of lack new topics.