The main reason is that the profits are bound to be better on this market than what you could get trading Forex, since the volatility that we experiment is higher and the cycles are faster than what you can see there too, however just as this is an advantage, it can also be a disadvantage, since a trader that does not have the skill to deal with that volatility will instead lose money because of it, and if that is the case then such trader may prefer to trade Forex for a time until they can adjust their strategy so it performs as they want.