Glad to your nice question.I think greed is the most important reason that lead to the loss in forex trading.because greed is one of the most dangerous attitudes that leads a trader towards loss.When a trader becomes greedy,he cannot control his mind from continuing trade.This happens mostly when a trader consistently makes profit in trading and thinks that all the times he can make profit.That time,the trader invests too large amount of money and trades without following all the necessary preparation and loose in trade....thanks for this allocation.