While Disney Parks are a portion of a company that tries to trade on and sell magic, it is still a company, with public shareholders. Even Apple, with it's $250 billion cash reserve is heavily scrutinized to make sure their revenues and profits are growing.
I certainly understand the frustration, and that part of what Disney has done was create a nostalgia that it's an experience, not a business. That said, I think people who get overly frustrated need to determine if they want to be a customer of Disney Parks. Disney has an obligation to their customers to deliver value and to their shareholders to deliver profits, so as long as the demand of customers is there to satisfy the supply of increased offerings, this trend will continue.
I know it's hard to believe, but it is possible that all these event are actually keeping down prices. For example, in the mid-90's it was $10 for a ticket in the Wrigley Field bleachers for a Cubs game, while today it is $85 for peak games, an 850% increase. The increase for Disney Theme Park tickets is only about 425% so not as bad as some live entertainment options.