Can't say for others but form my own experience. There was one time I need to pay the rent.
So I have to sort out all of my altcoins I hold and find a coin that has the least chance to have a good price at later.
Even though it was at the bottom price point when I selling but I have to do it.
Not all altcoins are falling because many have good prospects in the future with strong fundamentals, now the price may still be cheap but in the future it can turn into an expensive coin.
This is actually an opportunity to get big profits with capital that is smaller than the bitcoin investment which now has thousands of US dollars in price. But be careful to pay attention to coins whose prices have long been stagnant, the coins can die slowly because they have no buyers.