With villas rising out of the reef above crystal blue waters, the Maldives are synonymous with luxury. Most of the 1.8 million tourists who visited the South Asian island state last year are on the deep-pocketed side. But the super-rich will soon have an even more exclusive option: a private island they can bid to stay on. The new concept is being piloted by Mohamed Ali Janah, group chairman of Hotels and Resorts Investment Maldives Group (HARIM Group) and a special advisor to UN Tourism. “I am building the most exclusive private island in the world,” he told attendees of the UN’s World Touris…