Back when the Christmas and Halloween parties started, there was a fairly big thread here about it. A lot of people were not happy about Disney double-dipping into our pockets. A park that was previously open all normal hours, is now closing early so they can charge guests an additional fee for a "Party".
It comes down to business. Disney has shareholders to answer to and is expected to show growth year after year. Profit is king, and Disney started to think out of the box to provide a new revenue stream. Then they took away EMH in the evening and started offering Disney After Hours. Once again, they found another revenue source.
It's a business, and as much as we prefer to have things as they were, there will be changes that are not in alignment with our expectations.