Many people are guilty of dumping, including me. Even those selling at this high price now will also look back many years from now and realise that they also dumped even though they think they are selling high now. So we all are guilty of dumps. Again, are those prices you quoted for 2020 or what because I know all three coins were at one time lower than that.
The prices are something like after the crash of 2018 when Bitcoin's price went to 3,000 dollars from 20,000 dollars. It caused mass panic at the time and many sold at a loss, those who purchased may have gotten lucky now as they have waited for too long and now they are getting the worth of their wait. I wish I have not sold some of my coins before but that is the interesting part of being an investor or trader, we don't know what the future might bring. We have to trust fate sometimes.