I highly doubt instructors are making big bucks from an incredibly complex course that so few people are qualified to take...
I remember watching a video on GUE TV that was like a conference breakout session with GUE's lawyer about managing risk and liability in expedition diving (don't ask me why, I was very bored...).
There were several high-level instructors in the room who started asking the lawyer about legal liability questions, including Graham Blackmore who said the American legal system terrified him.
The gist I got was that instructors are particularly worried about T3 classes, which teaches expedition level diving, because there are so many ways it can turn deadly. In addition to the ethical concern and reputational risk, waivers don't stop you from being sued into oblivion by a grieving family.
My guess is that a few of the top GUE tech instructors (Graham Blackmore, Mario Arena) are piloting T3 in an invite-only way and trying to work out the kinks, including things like risk management.
(You will notice that no T3 classes have been held in or are scheduled for the United States...)