We have known for months that models can only be flown for 1.) sport, 2.) recreation and 3.) contest

If you are flying your model for any other reason, (such as earning a living), then you are not flying a model aircraft. And soon you will not be part of the FAA exempted CBO known as the AMA. (and this thread becomes a mute point)

If clubs have been allowing professional demo teams to fly at events and those lcubs had the impression that these pro demo teams were insured by the AMA then they were mistaken. But, I do not believe that clubs knowingly applied a double standard. They simply believed the pro demo pilots were covered by AMA. The demo pilots probably believed the same thing.

So now we know. Let the world know from this day forward that pro demo pilots are not covered by AMA, and depending how much free swag a unpaid demo pilot recieves, he might not be covered by the AMA either. Well, there is only one way to be absolutely certain. Don't allow any demo pilots at all. That would be my recommendation to any club concerned about this matter.