My thought on keeping the same course was only if it was going to be run as a Novice or beginner class. It would keep the newbs from being intimidated by competing against upper level guys, and limit the man-power need for course building and judging.
I definitely see the motivation. Our club isn't one of the biggest however so unless we had some of the seasoned guys competiting then the newbies wouldn't have anyone to run with. Larger clubs wouldn't have this problem possibly.
The manpower and time are the biggest factors though. Although this would also be a great class for people to learn how to judge and scorekeep.