I think comments helping with rank are pretty important. Not because going around posting random, pointless, comments is a way to boost your rank. I also don't think that commenting boosts rank enough to make commenting that much worth it, but that's just me. Where I find the value in the comments is that a review with comments seems to draw comments and questions from shoppers more than a review with no comments on it. It's kind of like casual shoppers don't want to be the "first post." At least that's what I have noticed. I don't have a single review that the first comment on it is from a shopper, and I don't think I've ran across a review yet where that is the case. When my reviews get questions or comments from shoppers, it's when there is already a good number of comments there. A number of comments where the reviewer has responded to the comments, also goes to show shoppers that if they do ask a question they will be answered.
This post is getting pretty long, but I wanted to point out one more thing about comments. I think the comments effecting rank does help spur people to post suggestions and helpful hints. Say if someone forgets to list that a toy is not safe for anal use because it lacks a flared base, another reviewer could add that safety tip in the comments section. That was how I learned what additional things I should include in a review, and I found it very helpful. Would so many people have posted on my reviews if they were not getting a benefit from it? I can see the comments dying off if there is no reward for people to comment on them. I think the comments and suggestions from other reviewers are very important, and I honestly look forward to what people will have to say about my review or the toy I reviewed. I actually wish people would comment more. When someone rates my reviews as "not useful at all" or "worth reading, but not useful" I would really appreciated it if they would leave a comment telling my why my review wasn't useful. At least then I could try to answer their questions, or write a follow up to include the information that people are looking for if not found in the body of my original review.
For the people who don't have the time to be on the site everyday, and who don't want there to even be a ranking system, why does it matter? If I wasn't interested...well, I wouldn't be interested period! If you don't want to be a part of it, then don't. Nobody is forcing anybody else to post comments or to compete in a "popularity" contest. I view my rank as a small reward for writing my reviews. I love to write the reviews, and it is a great hobby that brings a lot of enjoyment and satisfaction. The rank is the icing on the cake showing that I really did write all those reviews and that people are enjoying my work. My daughter is proud when she does a good job at preschool, but the stamp on her hand is her proof that she can show me when she gets home. I have been proud of my rank no matter what it has been at. I started out at the bottom like everyone else. I felt pretty good when I got up to 3.5, 4.0, 4.5 and up. I wasn't getting "better" than anyone else, in fact I never judged myself against others. I view each new rank as an accomplishment that I had worked for. I don't care what "place" I am in. I want to eventually get up to rank 10 if it's possible. I don't care if there are 5 or 500 people in front of me. I care about my rank, not who is in front or behind me. I am trying to lose weight, but I don't go to a public place to count who is "fatter" or "thinner" than I am. A smaller size of pants feels great to me, not when I get thinner than someone else. It's petty in that context, isn't it petty in the context of review rankings as well?
Once again, I apologize for my insanely long post