But then...

Mr A has a proven track record! He made $X million dollars in Y months, over Z% returns on capital!

But then... market condition changes. The US stock market has been experiencing bull run till recently. Hope that he continues to trade and make money and be transparent about his trading...

Mr B is a former bank/professional trader in a well-established financial institution for over 20 years!

But then... many professional traders who had good trading results do not get the same good results when they become retail traders. Professional traders worked with institutional-level rules and regulations. Retail traders only have ourselves and they would find themselves grappling with their own discipline. Professional traders have all the most expensive trading stations, equipment, analysis software and newsfeeds, because they are provided by the institutions. Retail traders don't have such a luxury. Professional traders trade in a group. They are supported by analysts for different markets and maybe by other professional traders. Retails traders are a lonely bunch. Furthermore, when Mr B says he is a professional trader who worked in a bank, he may not be really "trading" like what we think he does. There are positions in banks such as quantitative (quant) traders that derive complex algorithms with expensive software to trade the market. So not too sure if this experience is relevant to retail trading...

Mr C conducts course for professional traders

But then... there is the million dollar question: if one can make lots of money from trading, then why does he/she still want to waste time teaching? Clicking a button or two to execute the trades certainly beats conducting 3-5 day courses, 8-10 hours a day, and supporting and emailing students everyday? Passion? Sharing? Out of good will? At such an extravagant course fee? Then again, successful professional traders may not be successful retail traders

Mr D manages investment funds

But then... managing funds require different trading strategies than that use for retail trading. successful fund managers may not be successful retail trader too right? cos retail traders dont have the capital to adopt fund management strategies...