It's a good rule in theory, but in practice, it's difficult to enforce. If a team is registering a bunch of below level players, at what point do you suspend them if they don't hit the at-level quota? Do they have to maintain that ratio throughout the entire registration process? What if the below level players are just quicker to register? Do you do it right before the season when the schedule has already been released and people are making plans? I've only seen this enforced once, and that was with a team that was out of compliance one year and the LLC let it slide and then started registering the same below level players again the next season and were eventually removed from the league when it was clear they didn't really have a line on any more at-level players to get in compliance. The team wasn't even a top team at the lower level, although I didn't mind having a match or two against a patsy to experiment.