They are serious collectors of items like coins and bank notes, stamps, precious stones, etc. They constantly expand their collections by subscribing to catalogs and magazines that cater to collectors, attending exhibitions and networking with collectors of similar interests. Based on purchases made, the monthly spending ranges from USD 500 to as much as USD 4,000. About 40% of these people indulge in their collection as a hobby, 30% as a form of investment for future gains, and 30% as a source of supplementary income.