Personally I don't intend for my tournaments to be only for the top 100 players. I want everyone to take part because a tournament is a completely different set up.
I understand what you are saying at but imagine if you have 10 tournaments and on each you get 100 different people to play that's 1k people which is not that much in competitive community. After 10 tourneys you still wouldn't know anything about the players skill lvl, and from COH1 we know it takes a lot of time to organize 10 tournaments.