in forex trading, risks and rewards are almost the same. so when we double the lot we will get double profit. but that is only if we win a trade, if we lose we will lose twice our money too. might be ok if we double the lot as long as we have a Google strategy. as we know there are several trading strategies that use double lots like the martiangle strategy. and when traders make risky trading strategies for this business, they can earn a lot of income and if traders invest low income they cannot make big profits from this business many traders invest big money in this business and they make unlimited money with this business.