Since we are on the subject, I would like to say that I hadn't thought about the classifieds. I see how they could be useful to some people, but I never thought about selling stuff, especially being across the border (extra shipping costs, duty, exchange, etc.).
I thought that the rating was to assess a person's credibility,experience, helpfulness, personality, etc. pertaining to their posts (and I guess it could be used that way too).
I understand now, and the whole thing makes more sense.