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This is usually the case most of the time with the exception of stablecoins of course.
From the perspective of investor like me back in the days, I usually sell my Bitcoin and altcoin concurrently whenever I get the earnings that I needed. I usually move these two holdings around whenever I need to, though I do not really trade actively until late 2018-2019.
Got more losses in alts than Bitcoin if you're going to ask me.
Since our major aim of investing in the crypto market is to make profits then I am not that surprised when we make profits and cash out the fund to prevent further loses that could emanate due to our unconsciousness about how the crypto market works.
The altcoins market is a safe one bringing big opportunities to us as the market keeps growing. We do have opportunity to buy coins during pre-sale and after pre-sale to make extra fund when our holdings starts accumulating some profits. The market is huge with so many opportunities for us to grab and earn.