Sure, but on highly leveraged financial instruments a sudden and unexpected move against you (say a 3-day limit down move on Orange Juice futures) could empty your trading account faster than you can say "margin call Gentlemen".
It's 20% of funds. So maximum (100%) loss for total funds is just 20%. Leverage is already implied in the example, no need to introduce it as another variable. You went with an example where a stop is justified and ignored the one where it wasn't (necessarily). There is no "one size fits all" approach in trading, yet people keep preaching that there is. Tiring.
