So they have more incentive to raise the mf then?
Maintenance fees represent the operating costs for the resort. Legally the timeshare manager cannot collect any more than what they are budgeted to spend, plus ancillary obligations like the management fee, property taxes and reserve fund contributions.
Management fees are standard throughout the industry. Without some form of compensation, there is no incentive for the manager to perform. Most of the entity we know as "Disney Vacation Club" is funded by that management fee. It isn't just money in the bank for Disney.
At the end of the day, you either trust the management company to run the program properly and ethically or you are better off moving along. Independent auditors and state oversight boards exist to watchdog the timeshare manager. If you don't trust that Disney is setting a proper budget, and that their auditors and the local timeshare bureau are doing their job in verifying the numbers, you will never be a satisfied owner.