My relationship with Hacker News is also much like this.
I have made exactly three comments before this one, and they were almost a year ago. If not for those, I might not have even created an account here. I just have the type of personality that enjoys taking in knowledge more than discussing it.
My account at Less Wrong is similarly neglected. I often wonder how many others (on both sites) do what I do.
That perfectly describes my relationship with Hacker News.
As another first time commentor but long time lurker, I'd like to thank those of you who do comment. You've created a truly great resource.