With your example, we know that from $1 to $3 is 300% price up and this is the time for sell to get the profit.
I don't know why people still holding if they find their coin price already multiplied 3x.
Even traders usually sells their coin when the price up only 10-30% already, we must learn how to know the time for hold or sell our coin.
Maybe he is not a trader and he is a proper holder who did a lot of research and trusts the project for the long-term. I am sure a trader will definitely bite the hands for a quick 3x.