The worst experience I've ever had was losing a Private key, and this incident made me very sad and devastated because in my wallet there are several altcoins that have high prices and several other altcoins that have the potential to develop in the present. and this incident occurred when my PC died and could not be used anymore. while all my data is in the PC. this is my worst experience, so for now all crypto files I have stored in the mailbox.
Imagine that as the most expensive learning experience of your life. There are thousands of people every year (probably millions) that studies in college and pay a lot of money, since they do not work they get a loan and then they are in debt forever. This is very true for USA, but I am sure there could be some other nations that have it as well, in my nation private schools have a last year chance for something like that, so it is sort of happens here as well.
This is why I believe that we should not be focusing on what we lost, but focus on what we learned and I am pretty sure many of those graduates with ton of debt never learned something as valuable as you learned by losing your private key.