For those people who bought btc at lower price i believe they already sold atleast 30-50% from their portofolio. I don't believe if there some people who can hold without taste any profit from their investment, atleast 10% from their holding journey.
for those investors who are professionals of course know how they secure their money or even with the profits they get.
it is usually done by selling some to get their capital back and the rest is profit which they will gamble again in the long run.
to get profit that equals your starting capital is a big relief to any investor on any domain, because just like you said, every penny after that is a profit that they should be happy with, they can make risks after that with at least some of their profit for more and big profits.