You got the points, not only traders, but also the brokers, program vendor, educators, mm trading site owners, signal vendors and etc also require new blood and suckers to pay for their salary.
As a prolific reader, you should know that truth-telling books that tell the reader they're idiots tend not to sell very well... Instead, it'd just be a chest beating/soapbox stumping/purging exercise for you... Possibly an expensive one if your time is worth more doing something else...
Wow nice to see the great conversation. Thank for all who made it and useful to all. Thank you verymuch.
Finding an edge is only something the very few will do. Everything else you can easily pick up from books or self study, money management, risk management, trading discipline, etc. An edge is the magic powder you sprinkle on top of it to make IT happen. Jeremy said it well in Margin Call, "the percentages, they stay exactly the same".