Some traders will not understand. The traders that have little amount of money or even high amounts of money that want to trade daily and also use leverage will always lose more than making profit. That is why they will always continue to lose. The people that have high amounts of money or maybe low amount, not using leverage but patient will make profit from the money those former traders are using to trade.
Those that have a small starting capital try to compensate this fact by using leverage, but this is just a bad idea, since exchanges often promote leverage by showing the incredible profits a person can get if things go their way, however they are very obtuse about the risks that entails the use of such a high leverage, so those that use it are completely surprised when their accounts get absolutely destroyed when the market moves unfavorably to them, with the most recent drop being a perfect example of what I am talking about.