The Gracies are milking Hollywood prissy celebs by handing out blackbelts to them like candy. Same goes for the Beverly Hills crowd. Saw some documentary on it a few years back, some wussy cosmetic surgeon that obviously has a chip on his should was getting his blackbelt in BJJ & self defense, it was LAUGHABLE.
I know Ed O'Neil is serious, he was training before the BJJ McDojo for Celebs campaign, so was Chuck Norris. Undertaker takes it seriously, but his body is too beat up to put serious strain. Kevin James loves this stuff and has for a while. You can tell who is even semi serious and who is doing it like a fad (Cruise, Kusher, Walker, and the rest)
The reality is that even with gi BJJ, you will get minor joint injuries and marks on your face, sometimes serious bruises. So these celebs need special care & treatment when training, like a baby, for obvious professional reasons. Plus, they are spoiled pansies who pay big bucks when their ego is being fed, and it makes great financial sense to cater to their ego needs, without exposing them to reality.