Cut your losses and press your winners. That is the "holy grail" in trading. Traders in general cannot follow this path. It is not a methodology issue but a psychological one. This is the main reason why traders failed because it is counter intuitive in nature. FXCM released a research last year that demonstrated that on average retail traders loose $3 for every $2 they win. This finding is consistent across every single currency pair in the research study.