Dude, do you want to discuss that we gamble or trade? Or do you want to explain probit global trading volume?  

From your own perception, you have answered that we don't gamble in trading. We consider it not only based on trading volume but also consider it based on the fundamental theory of trading itself. Gambling is totally based on luck, while trading is based on the knowledge and experience we have. Success in trading depends on how good our knowledge is. The knowledge can be derived from reading articles or watching videos about how to trade properly, also we get some knowledge from our experience of practicing trading for some months or years.