There have been so many times I've been at jiu jitsu and asked people if they post on the underground and everyone always says the same thing. "Uhh... yeah I know what it is but I don't ever go on.. meh meh meh".
I find it hard to believe all these die hard MMA fans that train jiu jitsu wouldn't check this place out.
Is it some type of unwritten law to not admit you are a UGer or something? 
I've been watching mma for a while and training bjj/mma for around 3 years now and only just signed up to the forum. Didn't want to get involved in half the arguments and I'm hardly ever on a computer. Having a smartphone makes it easier to join in now.
First rule of The UG.....