Based on experience (retired mod here) in organizing such events, the minimum stat requirement is justifiable since sign-up numbers can go as much as 800 different people. They said only 380 players maximum to war; they had to cut down somewhere. And again speaking from experience, the most difficult stats to match are below 30mcs. There are more newer players than older ones at that stats, something like 1 old for every 20-30 new. That right there is just very difficult when it comes to a fairer matching. Besides, there's still hope. Should the assumptions been wrong, and there are less than 190 matched players then they can add some more below 30mcs.