Quote from Raystonn:
Most novices lose money due to commissions and other fees. If you had zero commissions and fees, it would be just as difficult to lose money as it would be to make it. Most "systems" created by novices are nothing more than random coin flips. Eventually you will tend to come out even, but with huge swings in either direction. Because novices do not have endless supplies of cash, these swings usually relieve them of their account balances. Add back the commissions and other fees, and the equity swings down become much larger than the equity swings up, even if you flip the buys and sells.
-Raystonn