There are millions of books on god, on how to beat the odds at the casino, on astrology and on any number of things for which there is no evidence.
Once again, what defxor is saying is that all those thousands of dollars you make EVERY WEEK are precisely in line with what would be expected out of a universe of traders all trying to make money.
Wall, meet head... head, meet wall.
There may not be any evidence of God or beating the odds at a casino or astronomy, but there are THOUSANDS of pieces of evidence for the effects of intelligent investing. These pieces of intelligence are in my banks vault. Actually banking is a good point. I let the bank look after some of my money. They invest it and GUARANTEE a modest interest rate of a few percent a year. Banks around the world all work the same way. How is that not PROOF? If it was all "random chance", these banks could offer no interest at all.
Again, there are A LOT of dummies out there who play but don't UNDERSTAND like some do. Perhaps the losses of these dummies means cancel out the profits of the more shrewd investors. That does NOT make investing a "random" process.
Man... Let me try one last time, for this I will borrow from Douglas Adams. He wasn't talking about investing, but I think the analogy will hold.
Imagine a little puddle of water wakes up one morning, looks around and thinks: Wow, I must be a really special puddle, because look, someone has gone to the trouble of making a hole in the ground into which I fit perfectly!
It is incontrovertible that the puddle fits perfectly in the hole, but there's nothing special about it. If there wasn't a hole, there wouldn't be a puddle to make the claim.
Now, you may think your special powers of analysis are what separate you from those who don't understand. But that is exactly what everyone thinks. And as has been demonstrated with the dartboard experiments, out of any given population, there will be some who will outperform, some will underperform, the curve is fairly well established here.
Take heart, though. If the variables were knowable, the whole market idea thingie would have collapsed decades ago... because someone would have written the book and... oh well, head and wall all over again.