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Actually , in Fx trading leverage are being choose according to the amount you are having which is your capital , moreover leverage is not a must so one can also trade normally without it. Using a stable leverage will also maximize ones profit and also maximize loss at same time, different brokers has their own leverage.
Leverage plays a good role for the traders who have smaller accounts. It helps them to trade as the huge investors trade as they get the option of trading 5000 dollars if they have just 1 dollar in their account. Isn't it an amazing thing?
While leverage is good, it important we consider the risk factor associated with it;
The greater the amount of leverage on capital you apply, the higher the risk that you will assume. So the in the event that lose, your losses will be by the same magnitude of your profit if your trade turn out well. Always think twice before you use them.