I could even argue the other side of the coin. A 70 percent win rate would need to operate within the mean of an instrument's daily range. With that in mind it would need to operate around news events and not through them. A 30 percent system is probably a trend following system and therefore a position in that system is held through news events. By their nature, news events are the most risky time to trade, I am sure we all agree on this. So with that in mind, I could argue a point of the 30 percent win rate being accompanied by more risk than a 70 percent rate. The more time you spend exposed to the market, the more risk you have to survive through.