You sell half of the stock/crypto when the prices double and then what you are essentially left is termed "house money"
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?
You mentioned crypto... I do not think it's a good idea to do this with a high volatility asset, you'll end up cutting your winners too early
There's a video I posted a while back of Dan Tapiero discussing that most retail investors (traders) are unsuccessful in trying to time entries and exits for bitcoin and other crypto assets
I think it's better to have targets of what you're looking for in a trade/investment and stick with it. If you're already in a trade and new information comes out which changes your opinion, you can always get out or add more
I have an extreme example of this, but I'm still in the position so I don't know how things will turn out
I've been hearing and reading of huge profit potential on crypto NFT's that also come with huge risk, so I bought some NFT's from 3 different projects
The 2 project NFT's quick lost value within a few days, while one of them more than doubled in the same time frame
Against your OP idea, I purchased more NFT's of the one that doubled. In about 5 days, it was up 10x, yesterday it was 20x from original entry, and today it's 35x
One NFT that cost $250 eight days ago is now selling for $9,300 (name of NFT is Bears Deluxe)
The other NFT's from the other 2 projects are down over 50%
Obviously since I'm still in the position on all of them, they could all go to $0 but maybe you get what I'm trying to say. English is not my native language and I have difficult time to convey my thoughts
It depends on the asset. If you're trading a volatile and risky asset, you should be getting paid the reward. Don't cut your winners in half

