They say anything that has a salvaged title goes for half of the current selling price of a comparable vehicle with a clean title. Typically market will pay more than 50% depreciation due to the title. However what will work against this is that anyone who will be buying a Roadster as a collector car will not consider a salvage, so the clean titles will always hold a higher value. There are others who beware of the salvage title since they don't know the full story on the car and worry about its integrity. So in essence you're funneling the market down to a smaller amount of buyers who are willing to purchase in that state.
In my own experience I've seen salvage title cars go for 30-40% of the price of a clean title car. I don't see that percentage changing for the Roadster.
While in many cases this is true, rare and collectable cars are somewhat different. Rarity of the cars will lift market value despite a salvage title.
A Ford Focus with a salvage title will have a different percent salvage cost relative to a 1969 GTO Judge, for example.
Our Roadsters are rare birds, and as such they will value out somewhat differently.
While I agree that a salvage title Roadster will not value out at 100% market value, it should be well above 50%.
That being said, I think my point about the car with the missing EMM is misunderstood.
I would throw in a new EMM in order to have a cheap roadster for me to keep and drive myself. Heck, I would even modify it to allow less computer restriction on the motor in order to allow greater high end and greater acceleration (There are rumors that Roadsters can accelerate better than 0-60 in 3.0 seconds when modified). There is no warranty, so who cares. Just modify away and drive it like you stole it. You can also try to make your own battery pack that allows duel charging, or anything else your heart desires. You have the PERFECT platform for a test vehicle!
I would not sit on it and wait for a used EMM to come on the market.
Anyway, that is just my way of looking at it, and of course I may be in a minority.
Your mileage may vary, as they say.
Best,
T