For me function trumps form, and I agree the worth of a vehicle is debatable based on the features and I agree that they probably have every pennies worth wrapped up in this truck. But to me when you get past $25k you are getting to the price of a truck that you should not have to touch and to me EFI would be one of those items that need to be there for the truck to be complete. I would also argue for most drivers and not wrenchers EFI is a better option and therefore should probably be there. EFI when properly installed is more idiot proof from a vehicle operators perspective. I don't build these trucks for a living so I am sure builders have a better formula for what sells than I do, but knowing what I know, I would expect to see EFI if I where putting down over 30k on one of these trucks, and I personally would walk away if it did not have it or it could not be thrown into the deal.
EFI can always be added, but half ass body work and overall craftsmanship tends to stay forever.
I look more at how solid the vehicle is, how well it was constructed and at what detail level. Things like tires and wheels, bumpers, etc. can easily be switched, and EFI can also be added, either in a factory Mustang style, or even easier with units like the Atomic.
I just find it funny how some see this as mandatory on all rigs over $XX,ooo, but I see all kinds of half ass built rigs (with or without EFI) regularly sell for significant amounts. To me, EFI is an option or accessory, not the bones of the vehicle.
EFI has is advantages, but carbs work well when set up properly (on AND off road). I have probably seen about as many EFI related breakdowns on the trail from EFI conversions as I have carb issues. The difference being, the carb issues are often easier to fix on the trail (adjust floats or needle valves, etc. with the most basic of tools) than tracking down a wire, computer or sensor issue.