In addition to the high volatility of such trading instruments, when you can either make good money or get a good loss, brokers have large spreads for such pairs. That's why I avoid this type of trading. I prefer to trade calmer major currency pairs, such as EURUSD, for which the spread at my broker fxopen is 0.00-0.03. At the same time, due to the low volatility, I am able to set small stop losses, which prevents losses from being critical in case of unsuccessful transactions.