Well, the SWDE game certainly worth more than $421, $1138, or $2187 to me. *this is the nerdiest thing I will ever post here.
I do think that the value of the DE titles in general have significant upside considering what can be done to them with a Pinsound card. While my SWDE will never be TZ, IJ, or AFM from a gameplay persective - the nostalgia train kicks into hyperspace when you can hook up John Williams soundtrack with Ben Burtt's sound effects.
When I'm done with my custom mix, there is no doubt that the value of my Star Wars game has increased to me. I would also debate that the value of the game will also increase to both pinball enthusiasts and other Star Wars fans alike.