Investing and trading is a zero sum game. Someone needs to lose and sell low in order for others to profit. If you caught yourself selling too early or too low. This trading or investing is not your thing.
Indeed, but at the end there is no difference to any other investment eg. on stock market. And it always is a good advice never to gamble with money you can't afford losing. For EDG I set myself a specific ROI and definitely will not sell before reaching it or lose it all.