I believe that the main and prime reason is that many traders are not sufficiently prepared because they do not take the time to look up what is going on so as to make sound decisions. Trading, unlike what many seem to think is not liek gambling and so it is not just about luck. You need to be very wise in your decisions, and these need to be based on your insight and experiences. It is not possible to never make a loss, but at the end fo the day you need to learn from mistakes so as to lessent he number of times you suffer losses. And to do this you need time, experience, dedication and commitment,.