ORIGINAL: GoNavy
Mike: I forgot one important thing about negative karma.
Rcu moderators decide whether or not to allow you to post negative karma. You might think it is deserved, but if they disagree, no negative karma will appear. User beware.
Correct and incorrect.
Old RCU moderators regulated negative karma.
New RCU (now) we do not regulate it. If you make an offer on an item you can rate the seller. A seller can rate any users who made offers on his/her item.