I paid $400 and 25 ship and $20 transfer for my blued one just like your SS one, and I was very happy it went so cheaply. A similar gun, it even had the "plum" frame, went for over $500 recently. A friend found an SS .44 with the heavy shroud, along with a ported 6" and non ported 6" barrels, with two grips, the factory wood and a rubber one, and the wrench, no box, and he instantly snatched it up for $525. It's in great shape and I showed him how to take it apart and clean it up, and he shot it last week, and he's hooked!
I really don't understand the pricing on DW guns at all. If you would sell it on the right day, you would probably get $600 or so. On the wrong day, $500 is about the best you could hope for. Sadly, that's the way it is.