Losers perpetuate this myth because....
Winners perpetuate the myth because.....
Its not a myth. There's perfectly good academic research thats backs this up. There's perfectly good statistical models that explain exactly why the latest broker data shows what it shows.
Take a look at any of the audit sites, they quite clearly show this is the case.
If you must, take a look at the monthly T2W competition data !
Take a look at CTA performance data
Take a look at survivorship data for funds.
There's no end of industry insiders who've let the cat out of the bag too.
Look at the published accounts from bucket shop brokers who trade against their clients, and a back of a fag packet calculation bears this out.
Even the numskulls working for brokers shilling their wares here at the zoo occassionally let the odd nugget of info slip, and when the do, it substantiates that the failure rate is well above 95%
Now start looking at some of the pro's, and look where their profits are originating from, trading, or fees ?
Now start comparing long term performance against what you might expect purely by random chance.... thats right, on average traders as a group perform SIGNIFICANTLY worse than a chimpanzee would !
The only myth is the myth that its not a myth.
As for the 95% failure figure, its an underestimation, and by a large margin. If people had little more tenacity and didnt give up so soon, the figure would be higher !