In the end this could actually serve to strengthen the currency, if their is huge signal-to-noise ration it may make people cynical to news about the currency in which case it could stabilize it in time of true crisis as the little boy could have cried wolf too many times. That being said, it's not like the same issue is not present in traditional financial markets its just that the club of people that can affect the market in their favor is fairly exclusive. As well over time their strategies had to become more sophisticated.