Things like the Concierge Collection and Disney Collection can and do change frequently. The number of points for those change frequently as well. I believe the CC is renegotiated every other year, and the DC is renegotiated at least that often, and maybe annually. Since these are hotels and resorts not a part of the timeshare system, the cost with them to exchange must be negotiated by DVD to determin what the point value should be. It's one of the reasons those types of exchanges are not the best use of points. While I think the II exchanges can be feasible "deals" for week exchanges, I think the CC and DC are way too many points per night to make them viable options.