....and since luck cannot be controlled sooner or later they will suffer a catastrophic loss.
It is not necessary, if a person knows how to distinguish when it is a profit due to analysis and calculation, and when it is due to pure luck. In the second case, you need to stop and not push it harder, so as not to try this luck and not take unnecessary risks. Not everyone who is lucky enough to make money in this way loses in the end. If a person knows how to manage capital, then he will be able to keep his profits.
A person will clearly understand the reason for the profit, whether it had happened out of luck or as a result of the analysis made. In all means users need to have patience handling the situations. Based on what the OP have achieved is great, because with $100 as capital making another $80 as profit in two days time is really big. One should not expect the consistency in the earning, because the volatility range varies and the same could cause difference in the earning. When it comes to trading, one should not allow the capital to go down in value.