If the registration was in auto I would agree with you but joining the event show at least some minimum activity.
I can agree that a table with 10 teams of 40% q looks silly (and rather tricky) as an active team can build a a squad of 80% quality to play seriously the game.
So I would say a q difference of 5% looks fair (ok max 10%) to make the contest interest.
Actually to be like associations. Close qualities.
I 'm playing the contest with four teams. I 'm waiting the end of day to show you the tables where 60-70% of the teams didn't play a single game.
Is this fun ?