I believe that's the dynamics of the market and one thing you most know is that there is ups and downs when it comes to investment and there is every possibility that after buying a certain coin it will likely appreciate as time goes by while in most cases it will depreciate after you have bought but so long as you invested on a good coin no matter how the price drops it will surely bounce back to it normal price.
When you say that, I only imagine one coin, namely Bitcoin, because so far everyone has seen that investing in Bitcoin in the long term is always more likely to win after the price of Bitcoin increases again and this has been proven in several market cycle. And I think investors who still like to invest in Bitcoin in all market conditions, of course they will not be so easy to let go of their investment and they will even prefer to wait for the price to increase again even though they have seen the price of the Bitcoin they invested in decrease.