Being Devil's Advocate here.... Comments as cited are in fact in opposition to the "instructions", i.e "your helpful comments for improving this image", and could be viewed as trolling. As long as this site has existed, people have complained about this occurence, and justifiably so. However, the opposite type of comments, such as, "Kewl!", "man your so awesome!", "plz give us more more more!", etc., etc., are equally in opposition of the guideline, though I've rarely seen complaints about such comments from the "victims" themselves. When you choose to select the Allow Comments thingy, you invite whatever in.