Hm. Way I look at it, if a guy's got less than perfect feedback, I look at the feedback of the people who gave _him_ a neg, and decide from that if I want to buy. "neutral" really is a negative, so see if they have many neutrals. I'm probably going to leave a neutral on a recent transaction, never needed to leave (or get) a neg.
But, if I bought something and it came not as described? You bet, I'll neg 'em. Just hasn't happened yet, I sell:buy at a 50:1 ratio or so.