Isn't bagging a round meant to hold your rating down? How do penalty points actually punish someone who is trying to lower their rating?
And really, what is the point of keeping your rating down other than wanting to play in a lower group?
A better penalty woult be to DQ the round and not include it in the ratings score.
Having a poor round removed from their ratings, to keep their rating up, is what the ratings manipulators are trying to accomplish. Once they realize they are having a bad round they intentionally play extra poorly, of just DNF. This had worked in the past because all rounds are not necessarily included in ones rating calculation (dnf's were never included). If a rating falls outside a calculated deviation from the mean, then it is not included in the averaging. Whenever you see a "no" on the included column of your ratings list, the deviation from the mean must have been met for that round.
And so this rule is meant to discourage people from bagging their round such that it falls outside of the deviation.