why most peaple fails in forex?

I wouldn't trust Forex if I were you. I've tried signing up for that website and they said that I had to be 18 to work with them. But, I am 18! This was back in October 2010. To the contrary of what you're saying about it being legal, I found out from a website called squidoo that it's really a scam. I can also assume that the reason why 95% of the people on this site fail at making money because the stock market is all about gambling. Even if you are a professional stockbroker, there is still a chance that the odds are against you and that you might not make any return on what you invested in. It's very risky business.

Basically it's gambling. But where you should in theory have a fifty fifty chance, in forex you have much poorer odds due to manipulation by bankers, traders, and crooks. It certainly isn't suitable for the home investor!

95% of people fail in any business venture. For pretty much the same reasons. Lack of knowledge, and lack of a desire to learn. At least that is my humble opinion.