Quote from cvds16:
if you think in fixed terms like 1 lot then you are perfectly right, but don't forget a lot of traders use a flexible approach with leverage related to their account size in other words they up their size with their account size and lower it if in a drawdown. I don't advise that but if you trade too big a leverage you might get forced to do that if your edge is not too consistent and has big drawdowns; if you do that and use too much leverage it's a killer. Some edges are hard to quantify so you can't really know in beforehand where you are going to wind up, that's why a lot of traders are really prudent about that and stress not to overleverage. you only know in hindsight what exactly your drawdown is going to be ...