Some currencies are meant to be close to each other. For example, USD and CAD will stay close to each other, and same story goes for USD and EUR. But when it comes to other currencies like USD and JPY, there is a great difference of value between USD and JPY, leading you to have more likely more number changes without having to use leverage. Let me explain. USD and JPY is around ~120, meaning $1 is worth 120 Yens. So, if the value changes a bit, instead of changing of 0.01, it will probably change of a whole 1 or 2 yens, because yen values less than USD. However, yes, when converted back to the USD, the yen change won't value much. That's why I want to see clearer answers about it: It is more profitable to invest of currency pairs with great difference of values, like USD and JPY, or it makes no difference, or should it be avoided?