Yeah, I don;t even know if those models were "endorsed" by Chrysler. I don't know that they will ever bring big money like a vehicle that was sanctioned by it's maker.(For example, the SuperBirds were assembled completely by Plymouth, and Charger Daytonas were sanctioned by Dodge, but modified by Creative Industries)
I see the Shelby Vipers simply as an aftermarket conversion...ya know, like painting dolphins on.
All kidding aside, that's why there is chocolate and vanialla...to each their own.