Would you have $100k now or would you have sold it when it tripled to $3000 because that would've felt like a really good return already, though?

Yeah this is the story I tell myself to make me feel better. I may well have even more regret! Or thought I was an investment genius and invested loads more and then sold it at a bad time.

yeah as Warren Buffett once said: "Our favorite holding period is forever".

That is basically my strategy. Everything I buy is with the intent of selling in a couple of decades when retirement comes, at the earliest.

It's a great strategy as long as there's agreement between people and that the "S&P500" (paste your) means something :)

I did find my passport at that same time and threw a lot more USD at it. It's nice.

would you keep it till today?

Probably would have sold it when it doubled and felt like a genius… and then an idiot.

yeh, that's true :) btw, I'm sure many did just that