Because the ideas that an enthusiast has may not be the ideas or opinions that the hundreds of people watching a show may have. Surely it's best to have feedback from the majority of the guests you wish to appeal to, than the enthusiasts which leads to very few people watching the show (or berating it if they have)?Why don't they want the opinions of enthusiasts? Surely we* know the parks much better than anyone else, and our constructive criticism should really be something they want so they can work from it.
*When I say "we", I mean all enthusiasts.
I'm as much of an enthusiast as anyone, but I can see why they'd want the majority opinion before making a change on something like this.