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This is not a problem or a serious issue at all, just a matter of curiosity. As I've been submitting Opinions for various videos during my time here at a-m-v.org, I've noticed the "Usefulness" rating on my member profile change, but I can't detect any apparent relation between the marks that I give or the comments I leave and the rating that results. I hasten to stress that I don't submit Opinions to grind a higher Usefulness rating by any means, but as a matter of general interest I am curious to know how they translate into a Usefulness value.