Another MAJOR reason most fail is they don't get the success relevant facts and overcomplicate instead of keeping it simple.
By contrast all good traders I know have kept it shockingly simple, have been great adherents of KISS, including Dan Zanger.
This is another hedge fund trader here stating what's really only obvious if you think about it:
D70
most "strategies" come from book reading, self served research, self served marked views and finally, others.
Dont be fooled into thinking that "experienced" traders have anything extra. A lot of them employ the simplest strategy you could imagine.
It's only logical.
Harvard did a rather well known complexity experiment where two groups of students had to come up with explanations to simple problems. The first group got the correct evaluation from the professors, ie if they had come up with a logical and rational explanation they received a "correct", if not they got a "wrong", while the second group got random evaluations, so that even if they were right they might have received a "wrong" and vice versa.
The first groups solutions were all admirably simple, while the second groups explanations became increasingly complex as they tried desperately to fit theory around inexplicable fact.
That's what you see on boards, those without success think trading is rocket science and waste their entire career in the market chasing a non existent holy grail
Contrast that with Dan Zanger and his simple chart patterns or people like Larry Hite who made the MAN group into the giant they are become filthy rich by trading trend following systems with all of 2 parameters lol.
A simple, robust system, and discipline in cutting losses and letting winners run as long as they do is all thats needed once one grasps that this is just a probability game in a market that is merely the sum of it's participants actions and not an elusive entity dancing to the tune of some great invisible conductor, that's all that's needed, and deep down everyone knows that, but after a few losses the majority will give up on their method and go right back to chasing some non-existent holy grail again.
Thats why most fail, they can't handle losing, which is part and parcel of trading, they can't let winners run, they simply need to be right more than they want to make money.