I think it depends on your personality type, you can have many people trading the same system, and yet only a small percentage succeed whilst the rest fail. If everyone traded the same system, and this was the outcome, then the small percentage traded what they saw and stuck to a plan, and the chances are that the ones who failed allowed their belief system to interrupt the process of a winning strategy.
Many people wants very good benefit or profit or even every expecting "profit"
but it is not that much simple...