I have a theory. Years ago, the
DVC bean counters may have figured they could sell more points annually by dropping the minimum buy-in to 150 points, selling a greater volume of new contracts than with a 210+ point minimum, as they likely saw a slight increase with the previous drops (230 to 210 to 170).
They also probably figured a fairly high percentage of new owners would "get their feet wet" with a 150 point contract, but then do add-on contracts to increase their ownership.
But the add-ons didn't materialize, and a substantial number of 150 point owners, rather than do add-ons went to a Sun to Thur only travel window, throwing resort usage out of balance, and increasing demand for Sun to Thur visits.
Now, it may not have been a big problem for a few years. DVC could have used the weekends for CRO reservations to offset the non-DVC trade costs. But, as the economy worsened over the last couple years, weekend cash demand may have fallen, cutting the ability of DVC to recoup those trade costs. At the same time, DVC owners that rented points were often seeing savvy renters who only wanted weekdays on points, substantially undercutting CRO cash reservations, and at the same time people with higher point counts than 150 who were renting points were causing increasing weekday DVC demand, throwing the system further out of balance.
Surely there was a combination of factors that would lead to a re-allocation.