When Ben Elliot and his cofounders set up Quintessentially in 2000, it was a London-centric operation with relatively modest ambitions. Membership cost £250. Now the firm operates in more than 60 cities, and has separate divisions for absolutely everything from property to wine. ‘Quintessentially transformed the idea of concierge services into lifestyle management,’ as the New York Times has written. Now Elite membership costs £12,500. You share a lifestyle manager with 20 HNW individuals, or you can opt for Quintessence, costing £50,000 for a manager shared with just two or three others. They do everything from closing Sydney Harbour Bridge for a marriage proposal, to arranging dinner on a floating iceberg.