I think that Disney also looks at the use year, whether it's a popular use year or not. For example, a March use year might have 50 people waiting for points to add on to their contracts, while maybe a February use year only has 1 or 2 people waiting for points. If the contract wasn't in a popular use year, and the points were stripped, I would think they might be more inclined to let it go.
A year ago I bought a stripped contract, which Disney let pass at below the usual cut-off price. Of course, it was a terrible contract--no points for this year or next year, and maintenance was only being paid month by month, so no deal there. The only reason I bought was because it had the right amount of points and I already had banked points that I had to use up and didn't need the these points now, and the price was right. Of course, Disney was not buying a lot of contracts at the time, either.