Emotions do play an important role in trading and investing. Fluctuating prices affect psychology and I think if we don't have a good trading and investment plan, we can panic and sell our tokens at low prices.
But if we have a good trading plan and invest for the long term, I think we will get profit as long as we hold the tokens.
I absolutely agree with you that trading psychology, good strategy and skills are the main part of successful trading. We should calm emotions and just follow the strategy. If we give up our strategy we are more likely to regret then. But if you follow your strategy and all the same you get losses, it is a signal that you just need to change something in your strategy.
Basicly most of the people are copying strategy from the expert to expect the win on the game, following the trends or sharing the analysis between the traders. So, i dont think theres a people who always loss in the trade, except its the one that always speculate and have a bad luck speculation.