FXCM's trading variety is CFD, and it may not place an order with the same size and position for you on the exchange. Within a certain range (personal estimate is 0.5%) and time (personal estimate is a few minutes, ordinary individuals are unaware of arbitrage opportunities), they are gambling with you in disguise. 1 point how much income can fluctuate is mostly determined by FXCM. Because it is not traded on the exchange, these tiny variables can be controlled, and the trading volume is similar.