Well, two rooms at the Dolphin are nowhere near the same amenities, or quality as a 2-bedroom villa at the Riviera. The OP's question/concern was about the dues, not trying to find the cheapest way to go to WDW, but perhaps I misread the post. It's been known to happen.
I 100% agree with you that you can find cheaper places to stay and go to WDW if that is the goal.