1) They are trading a market and time frame that lacks opportunity;
2) They are trading a method that does not possess an objective edge in the marketplace;
3) They have a promising market, time frame, and method, but are not executing it properly.
Of these reasons, #3 is the most frustrating for traders. They feel as though they have the tools to succeed, but they themselves get in the way of their own success. Many times this is because emotional factors interfere with sound decision-making.