Estimated value 3.3 mil when all are fully restored. I can't imagine the cost of restoring only one. I found the information below from a link at the site you posted.
The first motorbikes to be made by the legendary Brough Superior marque in over 70 years are set to be rolled out onto British roads.
A limited production run of 300 Brough Superior SS100 machines that were made between 1925 and 1940 is nearing completion after a British businessman bought the rights to the company name.
Mark Upham, of Taunton, Somerset has already secured dozens of orders for the modern-day version of the vintage SS100 bikes that were described as the 'Rolls Royce' of motorcycles and were the fastest machines in the world.