DVC is management of the timeshare and DVD is the sales arm. DVD controls all the exchange type perks including DC,
DCL, RCI, etc. In addition, per the POS, members have signed away their rights to vote for all but things that would significantly and obviously affect a majority of the membership in a negative way.
As to fiduciary responsibility, realize that this refers to management of the timeshare, something that they do fairly well, IMO. They are not involved in sales or resales, this is DVD's area which is technically and legally separate. They can't be responsible for something not under their control. In addition, the POS clearly states that one should not buy with the expectation of resale or rental and they are required by state law to include such language. You actually need to read both statuetes 718 & 721 to get a full picture. In addition, there are a number of individual rules that come under the statutes.