I guess we're finding out the price for originality!
I would say that earlier this year, a beautiful Europa with a Zetec was sold for a lot less than more original cars sold for. It surprised me that originality seemed to be that important to people. Consider if your car is missing the tool kit, the choke and heater cables, the headlight and dash light dimmer knobs - those items could easily cost upwards to $1000 or nearly 5% of the value of the car (and as 4129R says, you can't easily see the heater and choke knobs)!
I'm certainly not disparaging of people who want originality so much. I marvel at them!