I disagree. They are buying up the small contracts to push SSR. As much as they would like you to believe that the recent policy enforcement issues are related to curbing commercial renting, the truth is they don't want families getting in for a 50 pt resale and transferring points in as needed.
DVC much prefers you trade out of DVC with your extra points where they can make a margin reselling your $6 points for $16.
By limiting transfers and buying up the small contracts they accomplish this.