I don't understand what you mean by "
points for a unit must stay the same for reservations."
Here is an example of where different point allotments cause an inequitable situation: DVD builds a resort with only two Residential Units. Each Unit is exactly the same size and each contains a single studio. DVD initially declares one Unit, but delays declaring the second Unit.
DVD sells the first Unit to Member A, who now owns 100% of Unit 001. To represent the real estate interest, DVD allots 9,862 to the Unit. Thus, Member A owns 9,862
DVC points.
Subsequently, DVD declares Unit 999 but decides to only allot 4,931 points to that Unit. Member B buys 100% of Unit 999; thus, Member B owns 4,931 points.
Since the resort has only two Residential Units, the resort has 14,793 total points.
But here is the problem: Member A and Member B each own 50% of the resort. They should share equally in the maintenance of the resort. Yet, Member A owns two-thirds of the points and, under normal circumstances, would end up paying for two-thirds of the resort's annual maintenance fees. The only way to correct this inequity is to say that that Member A's points belong in a different class than Member B's points, and that Member A has a lower annual maintenance than Member B. Other problems would arise because Member B owns half of the resort, but only has enough points to book one-third of the resort's total accommodations.