Sometimes the DC discount is NOT the best economic value. Since it is only available by purchasing in advance (as part of a room/ticket combo), you must puchase UPH passes for the entire length of your stay. When you purchase through CRO/WDWTC, you cannot drop the day of arrival or the day of departure. Dropping one or both of those days is only an option when you purchase the UPH passes at the resort. (Some CMs allow you to drop either the arrival day or the depature day, but not both, and there have been reports that some CMs will allow you to drop both.
In summary, if you will be arriving at your on site resort late in the day or departing early in the day, do the math! The advance purchase Disney Club discount may NOT be your best option.