One theory is maybe they love reeling the
DVC families with the under-pointed December pre-Christmas season charts knowing tickets are super expensive that time of year, holiday splurging mentality helps sell upgrades and special meals etc, and DVC people wanting to share this special time at WDW with friends and family who help increase sales in all those categories even more. In turn the heavy demand from DVC helps boost overall perception of best time to visit, while Disney knows it’s one of the best times that guests part with their money.
Fixed week might come into play. I just see alot of high and low value outliers in DVC that
point chart changes continue to leave unaddressed, so maybe some of it is intentional by DVD/Disney for how they want the DVC program to work. Like leaving those 1BRs high points even though home priority demand depletes very few, or leaving the super high point Bungalow and CCV Cabin seasons with low demand alone because they’d rather keep studio entry low points to attract new members, and these special digs are still a good way for traders to burn excess points, plus I can’t see DVD minding the breakag even if other categories perform better for them. Maybe DVC isn’t fixated on balancing demand and instead it’s a mix of doing enough to keep the membership placated while taking some of the business needs into consideration as well.