Some resorts for whatever reason decided, when building and creating the timeshare offering, that MF's would be a flat rate regardless of size. It is written into the CC &R's and require a super majority or such to change. It takes more than a simple board vote. An organization like Holiday Inn Vacation Club that controls the vote of all the HICV members probably could get it changed but there are still a lot of deeded owners not in HICV at Orange Lake.
In addition to Orange Lake East Village, I also own one in NC and one in SC that also does this.