It's pointless having regrets, you only get one life so embrace your decisions and let go of the past. If you don't then it can start to consume you and it'll only make you depressed thinking about it, that doesn't help anyone. Pretty much nobody could have foreseen bitcoin growing from being worth cents each to a hundred thousand dollars - it was worth what it was at the time. Of course anyone who had the choice to swap how they spent bitcoin in the past would trade it for the value it has today, that's obvious. Who knows, it may have made someone very happy at the time and a few people might have even increased their bitcoin holding then kept hold of it until they could cash out at todays prices.