There's a lively discussion currently going on in
Dance Forums regarding a review by the DanceSport Council of the proficiency points system.
The current system in the US and Canada is a "Point Out" system. Under this system, competitors dance out of a level when they've achieved enough points. This ensures that competitors in, say, Silver level, don't find themselves forever competing against someone else in Silver who has been there so long that the couple continues to win with no hope for those new to the level.
In pretty well all of Europe and other places like South Africa, DanceSport uses a "Point In" system. Under this system, couples cannot dance a higher level until they've earned enough proficiency points to "earn" the right to dance at that level.
It's an interesting discussion. From my point of view, these systems currently in place make sense for each of the regions using them, largely because the surrounding cultures lend themselves to the reasons why they work well in those cultures. But it's always a good idea to ask whether a change should be considered. The collective wisdom that has been expressed in the discussions is quite helpful to give a broader perspective on all the issues involved.