beth83:
You are right about a few probably making up the bulk of the comments. Looking at the stats page on comments will help you see that. And if you're really bored and look at the member pages, you will see that some readers have read several thousand stories and left only a dozen comments, if that many. I know that I will never get my comments to stories read down to a 1 to 1 ratio, but I am down to about 1 to 1.88.
You're ratio is pretty impressive; I have to hand it to you. I open many stories that I quickly find I have no interest in, do not finish, and leave no comments for, which hurts my overall ratio (which isn't bad). Studying the stats page, I've figured out that the comments are NOT quite so concentrated as I had guessed. The top hundred or so probably have no more than 70-80% of the total comments, which means that there are a bunch of small-time commenters who, in toto, give significant feedback.
As bad as the worst commenters seem now, it was worse yet back just 15 months ago. No one had read as many as 3,000 stories back then, but there was one member who had read nearly 2,500 stories without a single comment, quite a few in the top 60 without even one comment, and a number more with only 1 or two. I have access to that trivia because I saved a pop-up exchange with Februs from back when my "Unappreciative Reader" was loaded, which when it garned like a dozen comments in it's first day was by far the most-commented story at that point. My how things have changed!