Tor because they don't follow money management,they have greed mentality and lack of knowledge,experience and practice with i think skill is very important for our trading in forex trading business and i think without learning we can not earn big success in our forex trading business and we can not depend on just our luck for successful trading in this business namely Luck is a friend of your career and make you successful in free of work and cost otherwise skills make you successful but this is your original work who make you successful.