This is a very common misconception about crypto investing. IF you are selling to cash out then I agree that it is crazy.
In crypto, even if you bought BTC at $20k each... it can be wise to sell at $10k each. That looks like a 50% loss so HOW?
SIMPLE. WHEN the coin you are buying is on SALE for more than 50% and is expected to rebound as strong (if not stronger) than BTC.
The catch is finding the coin that will out perform BTC. Many would rather play it safe and just HODL BTC and that is a perfectly good way to go too. I just want to present the alternative and how it can work.