That is the limit theymos added a while back
OK, new limits:
- You can't give more than 5 ratings to a single user.
- Your total sent ratings is limited to three times your activity, but at least 1.
- The comment length is limited to 600 characters, but each newline counts as 120 characters.
IMO "did tons of trades with this user. All of them went fine. I trust him/her" should be enough even if we are talking about 2 or 2 dozen trades...