The only thing that proves it works wonderfully is Form 1099-B that comes at the end of the year from your broker(s). I am not asking you to show P&L by the way. Just making a point, and I think this is why so many want proof. The other part is as I said before just water cooler gossip you see everywhere in life.
For example, I read a story of a guy who ran a fraud small time hedge fund...........
http://www.cleveland.com/court-justice/index.ssf/2014/02/copley_investment_manager_char.html
I read some discussions of him from people close to him, and they say he had a lot of trading knowledge and many people respected him. So the question was: why would he do this? Why do these dishonest acts when you know you cant keep doing it forever? Eventually you will get found out.
The answer is because he thought he would eventually "get it". Eventually he'd start making all the money his hindsight analysis and theories told him he should be making. There fore it was ok to use client funds for personal use and "live the life", because he would soon make it all back and then make things right again behind the scenes.... and no one would be the wiser.
The moral is: don't assume anything works until it produces consistent positive P&L with real live money. Vendors can lie and deceive. Other traders you talk to can lie and deceive. Hindsight charts can lie and deceive. But P&L always tells the truth. The 1099 is never wrong. This guy Davian was lying to himself, and to others. He put the cart before the horse and paid the price and so did those who trusted him.
I think what guys are saying here is not to troll those who wish to learn trading and to improve their financial situations. Just saying: the trading biz is truly bizarro world so don't take anything for granted.