Trading with moving averages

As many of you already know, Forex is the most amazing and popular electronic financial market: it moves 1.5 trillion dollars a day, what NY Stocks market moves in a year. A 24 hours a day, 7 days a week market, with high volatility and liquidity, and with a plus advantage: leverage. A market where you can choose to go bull or bear with no cost: no extra premiums to pay, no additional options. It seems pretty much convenient, right? Well, let me tell you the disadvantages before I continue: