So, at the bottom of the linked article it states:
"Such is the excellence of its design, Oku says, it is patenting it, having spent about £1 million on laying the new track."
Perhaps I'm wrong here, but that means 1 million Yen? If so, last I checked 1 US Dollar equalled about 115 Yen. That means the track was built for a little less than 8700 US Dollars.
I've always thought the better tracks were a couple HUNDRED thousand to build... Confused...