Anticult -
Once again I have to disagree with your belief that the contracts are unique to LGATs. Forms of these indemnification clauses, etc are found in almost all sports related contracts. As anonymous39 pointed out skiing has these clauses, as do Scuba Diving, Bungee Jumping, Horse Back riding, membership in Club Med etc.
Clearly you have very strong opinions on this subject. Perhaps
Forum:
Large Group Awareness Training, "Human Potential"