You sell half of the stock/crypto when the prices double and then what you are essentially left is termed "house money" as you have gained your initial capital back, and you can let the house money ride as long as possible without worries. Is this a fallacy? As you sell half of it and gained back your initial capital but then again you still need to put that amount into something else and it has to double again, "house money" in reality is still your money. In my opinion, if a stock/crypto is worth holding you might as well not sell anything even after a 2x.
I do see some good points in it though, I guess psychologically this method can be effective as the money is viewed as house money, and people would not really panic sell or be as affected emotionally if it goes to zero, and they would let it ride as long as possible which sometimes gives exponential returns.
If someone has employed the house money strategy before I would like to hear your thoughts and how
did things work it. Would it be better just plain not selling or better yet to trade it?