I think the value of these cars is in the ability to register them in the EU still persists. Once that door shuts the prices will drop I'm sure. This car also has value in that it can be converted to LHD relatively easily compared to later Hawks. It's age may also make it easier to export to the USA? As with anything, it's what any potential buyer is willing to pay and how many are available at any point in time. Wait and see I think but I guess the seller got so much interest at the original price that they've decided to see how much they can get for it.
Guy