Crypto is wild west. Scams/hacks, all the new ways to get compromised never ceases to amaze me. Yet, it remains one of fastest way to build one's portfolio, once you have made enough, secure it, diversify in real estate, gold, etc.
You could having million dollars worth crypto in your wallet and next moment, puff it's gone.
Yes, you are right, that's what I'm sure is also experienced by many altcoin holders who are very happy to see their portfolio turn green, even by hundreds or thousands of percent and continue to keep it because they are not satisfied with the profit they will get if they sell it at that time, but the story changes when in a short time the coin have no value at all, often what makes them not sell it is because they think the price will continue to rise but because we don't know what the developer is planning behind these coins and so on, we don't have a true picture of the coins. Changing it into a form of investment in gold, property or investment in a form we can hold will be much better.
Correct, even if dev isn't planning anything shady, market can take a downturn and that particular alt may not rise even with a significant update/news.
It's always wise to take profit. Myself have given up plenty profits accured in alts by holding them for long time, with the hope that they will rise further and further but market takes a hit and most of they turn to ashes or go to depths to never recover from.