These people currently reside in very up-market districts or in luxury residential buildings. Their names are derived by running various databases such as credit card holders, frequent flyers, magazine subscribers, catalog buyers, etc., against listings of affluent post codes and/or luxury residential units. With their very high disposable income, they are prime prospects for exclusive clubs, luxury travel, designer labels of clothes and accessories, private banking services, real estate, etc. Source: in-house databases run against city listings of affluent post codes and/or luxury residential units (supplied by realtors).