People are always in a hurry and always do it very quickly, but then very often it happens that people regret that they did wrong and made conclusions very quickly. Perhaps this can be called a panic. Therefore, I think that it is not profitable.
Some sell quickly to avoid big loses so in this case it is depends on the altcoin you are investing. Yes panic selling happen for those who did not know the altcoin they have. Only hold altcoins that is worth and profitable and sell altcoins early if their is no future on the project.
The current world, money is the only thing for future happiness so peoples are buy at starting time and selling at future days because they fix the low budget at starting and continuous investment is increase the altcoin value but most of the peoples are concentrate the Binance exchange because number of investors are available, so once it is launched in this exchange surely it will make big profit. I think profitable altcoins only selling in this year and last year because market will move to forward soon so long term holders also sell on next year.