I experienced Moderator closure of a ticket that he had direct involvement with. He felt that his solution was the best so he awarded himself the most points, but one of the other contributors had a much better solution if not the only solution.
If fell that any meditator that has direct involvement with the question should not be able to close and award points as he/she feels fit.
This is a bias and is something that can easily pad this persons points.
As you can see from the example I linked above.