This is very true that huge number of people can't make them happy in trading and they continue. Though without this, it will be difficult for them to understand the situation when it should be done. Some people get triggered for losing money and then they again tried without proper knowledge and lost again. So proper knowledge is needed to be successful in trading.
You are very correct, but I believe we are back to the initial point where I mentioned that knowledge can be fairly simply learned. And then there will be psychological biases, which can be eliminated via hedging or algo-trading.
Generally those who have a lot of good experience about trading and are the 1% traders who earn through trading on behalf of large businesses and investors. There are many good skills about crypto market. They are very good at investing in both long term and short term. It is very easy to understand the rise and fall of tokens for profit. They have the opportunity to profit from all kinds of investments. All traders need to calm their minds and observe the trend of trading.
Don't you think it can be also about the instruments which they use? I believe that might play the greatest role in the end.
Well, there are too many factors to consider if a good trader will remain in the trading field. Perhaps they feel comfortable with their stable income through trading. As I can see here the possible reason are, they had a good experience, they had more time to research for any new update, and most of all, they had tools upon giving technical analysis when you execute in trading. Traders that experienced a massive gain will always repeat what they have done but those who experienced losses, will never come back and think of afraid of losing money.
In trading, there could be a winner or loser, not all become a winner, and not all become a loser. Because that is a kind of competition.
In trading, there could be a winner or loser, not all become a winner, and not all become a loser. Because that is a kind of competition.
You touched upon a great point about tools & tech analysis
I wanted someone to bring it up, so I could point out that it's not the case 
With tech analysis it's known that it doesn't work at all (https://en.wikipedia.org/wiki/Efficient-market_hypothesis). But for the tools - that's my favourite point. I believe now as we live in the end of 2020, so many people are falsify believing that technical tools can help to profit from trading... however, my opinion is that it's false due to the currently overhyped "Tech" in every aspect... FinTech, MedTech, EdTech, AdTech, FoodTech, AgroTech, "You Name It"Tech... - just a "Tech" hysteria... But the financial elites and the top traders and investors are able to profit where you, me, and common people like us cannot profit, because they have better Financial Tools, not the Technological Tools. If I give you access to Bloomberg Terminal - you still will lose money if you trade the way you did before, and the things you used to trade. But on the contrary I can give you free Excel package, and allow trading in equity swaps, total return swaps, structured products, infrastructure assets, top VC deals, and you will see how much your returns will improve from there on