Profiting 70% of the time is pretty exceptional. Even with insider info like that I can't imagine anyone being able to consistently do much better. The few trading strategies I'm familiar with, you have an expectation that you probably won't even take profits 50% of the time, but that the risk/reward ratio for every given trade is at least 2:1, ideally higher. So you can profit even around 30% of the time as long you're cutting losses intelligently and only trading high-reward plays.