I think being active does help your hub scores... just because you are drawing attention to yourself. And, if for some reason you answer a particular question or comment in a rather crafty way, a person might go visit your profile and check out your hubs. Therefore, you are getting more traffic and your hubscores will go up.
Not only that, but a person who is active in the community and becomes known for quality content, will also be followed by many and become a favorite of many. I know a few hubbers who write absolutley funny stuff. They have a lot of followers and I think all of them comment on every article. They have become known, and they have made themselves known because they were active in the community!