double profit double profit but also double profit too, double profit can bring double profit but not necessarily because it can also bring double losses, forex is a risky business and you can't be 100% sure the price to be moved in favor, I hear people open a lot bigger and multiply the money there in one day, but they are more experienced and pro. And double lots will give you a double advantage, but that depends on how you use it. Some traders trade with two lots and set different targets. I would prefer to set only one lot with one target because if the first lot hits the target and the second lot doesn't get the target but backs up to reach the stop loss, then that would be a futile effort. If you are sure of your analysis, just use one lot size.