While the coronavirus outbreak has left many people self-quarantining in flats of just a few hundred square feet, super-rich Asians have a more appealing option for refuge: their own private island. Sales agents say they have been flooded with enquiries from Asia’s wealthiest seeking an investment that can serve as both a bolt-hole from the raging pandemic and a long-term investment. What is more, while some of these private idylls sell for up to US$100 million, some go for as little as US$55…