You can always get a full room of insane people just go spam invitations to people you know like to play impossible stuff and that's all. Done that in the past it's quite easy.
By the way, being able not-to-read shit, play AR 500 and spam z/x means nothing. That just means you're a speed player, which is completely useless since being able to clear hard stuff means you can clear it, not that you can properly play it. That's why speed players are just... "that crazy guy who can stream 400000 BPM and play AR 5000". Then if you're a consistent player, getting good acc and a few misses on anything you play, having to drill a few times some very hard map to get an FC, and can play like a speed player too, then you're actually very good.
Most "impossible DTs" are just impossible because you either gotta spam or have to read very high ARs, first is retarded since there is no point on clearing some map with 80% and random misses all over the map, second one is meh, reading AR 9 DT or more is a skill itself with no much use. I'd rather be a consistent player, getting good plays all the time without much practice rather than a super speed player who can clear stuff nobody really cares about with terrible acc and 500 misses. xd