The thing is that some people don't just learn the basics, and they might have heard from their friends that they can earn a lot of money from trading, so they just dive into it without learning first. Trading profits are not a stable source of income, as they usually vary and also depend on the amount that the person has invested. Some experienced traders are making big profits too, but they put in a huge amount and risk their investment, so if it turns out to be a loss trade, the amount is usually huge too.
Without learning they can achieve for one or two times but not always because without learning the basic things they will not be able to go according to the market which is the actual thing.
When someone tell us about investment in Bitcoin then we don't listen to the whole talk but just wants to get large amount of money in second and skip the risky part of it. When we skip one part and accept the other then this things become a cause of our failure because we have to accept both negative and positive side then work according to it and we cannot skip one of them.
Experience traders are making big profit but they did not become Experienced from the start but they initiate trading with little sum and when they realized everything then they enhanced their sum as consequence of which their profit also increased.