Excel lies....no account has been taken of the players who played lost a few then departed fbefore ever entering the lists...
I wonder if changing the system such that unrated players did not affect the ratings of the people they played until they had established a rating for themselves. At the very least it would discourage the one day ratings boosting campaigns since they would have to compete and complete against 5 already rated players before being able to have an effect.
The time taken to establish such a net would surely discourage the more casual offender.
It would also encourage even the most sensitive ratings protector to play unrated players... thus giving them a genuine start value.