Because they narrow the scope of their appeal. Walt wanted the masses, not the best businessman but he had heart.
If you only sell lambo's and Ferrari's you don't have anything to offer the Chevy guy but hey the Chevy guy shouldn't feel bad he can't get what the others are having? Maybe he should just find a better job? Can't afford DVC/Club 33? Then we don't want to associate with your kind. Sounds like words right out of Bob's mouth from his corner office with a shower and stock options.
The goal to turn the park experience into an exclusive club is obscene and degrades the heart of 60 years of creation