1) greed 2) stubbornness 3) margin 4) high expectations 5) uneducated 6) mislead in no particular order
FUN OF GAMBLE As a dedicated/addicted trader, any trading strategies could be applied, EXCEPT gambling. You're going to kill your trader's life, once you begin gambling. In fact, I quit thinking of gamble after taking up trading....
Commissions - I don't agree that losses / mistakes can be categorized as expenses. The loss is either an outcome of errors, or to be expected as part of your strategy.
For me its time. You can always recoup losses and overcome commissions once you become profitable but you can never have time back.