I've already posted before that we do the ratings as a customer service more than a precision system.
The website implies the rating system is a benefit to membership. It seems to me it is more than just a customer service, but is a reason that many people become members.
On a side note, I'm in favor of a rating system that is based on the course, not on the other players. I know I've heard that you can't do that because the course changes each time it is played, but it is done with the Handicapping/course rating system in ball golf.