I don't think it's anybody's business what a seller asks for something or whether he or she makes a mistake in the listing or anything else. People can't make public comments on ebay about items being sold, they can't make public comments in Craig's List, they can't make public comments in newspaper classified ads, etc. I see no reason why the classified ads here should be any different. I don't think any comments - positive, negative, or even "PM Sent" - should be allowed. When an item is sold the seller can post "sold" and that's all that's needed. If you have a problem with a price or description or anything else send a private message to the seller, there's no need to tell the world what you think about someone else's ad.