Also, the only aircraft this thing can actually handle are Harriers and helicopters. And nobody will sell you a Harrier. So all you've got is a yacht with an oversized helipad, which is no better than any other billionaire.
As a purchase goes, it is totally pointless. Even as a golf course ... it would be a very boring course.
Given the size of the thing, the crew you would need for it, that it is at best a glorified helipad, and one that is nearly 40 years old,