Tomorrow I may ask my best friend to punch me in the face and give me a bloody nose. If I get punched in the face enough times, I will learn to deal with the pain and suck it up like a man.
The reason the statistics are at 90% is probably because 10% have stuck around long enough to learn and adapt.
If you get punched in the face enough times, you'll soon learn how to dodge a flying fist.
Tomorrow I will probably get sucker punched yet again by the market. However, I'm going to keep at this until I can deal with my own emotions.
I'd say emotions are #1 for losing money. I am re-reading Douglas' book and I must say that I'm now starting to understand some of this psychology. I need to learn that I am capable of pulling money out of the market. (I am certainly capable of giving the market my money -- well beyond commissions -- so that is emotions for you).
Just find a nice solid brick wall and smack your head against it until it hurts too much to do it again -- that's what I'm doing with the market right now.