We had originally built the private comment feature to allow contestants to send messages to CH when they want to discuss something which is truly private (such as discussion about specific entries). However, we are finding that some contestants are not using this feature fairly.
If anyone is using this feature to get an unfair advantage by asking questions that could have benefited others as well, it is not cool. While we do not have a policy on what is allowed in private comments, everyone should use their best judgement before posting a private comment. You should ONLY post private comments if your question or comment includes a topic that must remain private to protect your entries.
In order to encourage a level playing field, we have added a new section in everyone's public profile page. This will show how many private messages that contestant has sent to CHs during the last 6 months. You can see that information under the Key Stats (Last 6 Months section).
Hopefully this would ensure that the feature is used only for purpose that it was originally intended for. If we continue to see a misuse, we will remove the private comment feature.