The value of any older car is determined by what someone is willing to pay for it. People want cars for various reasons, the most common being they like the way they look.
If you want to have a rat car, OK, I get it, I have a few of those. There are lots of them out there. But if you want a nice car you might have to buy a project car and make it nice yourself. There aren't as many nice Scorpions, available. Turning a project car into a nice car is not cheap, takes time, and of course you have to have lots of different skills. There is a lot of wisdom in the advice - "Buy the best one you can afford."
To me it seems as if the car in the auction already had the hard work done, and done quite well at that. If the buyer wanted a Scorpion, a nice one, that car was an excellent choice. As stated above, you would have a hard time duplicating it for the price paid. And, you would have to spend a lot of time on the project. I fully understand why the buyer would spend as much as he did to get that car.
From his comments it sounds like the buyer plans to pickup the car and drive it home himself. That's the way to do it, IMHO.