I cry every time I think about the fact that I managed to CPU-mine 50 btc, and sold it for nothing.
Still, I did get a payout from the mtgox disaster and its a decent amount really, considering I put in less than 100$ from the start. Just far from life-changing amount, more like "ok, this gets us a nice vacation trip!"-money.
I still have the postcard from Japan from the legal proceedings!
There's a ton of things I could regret.
BTC price going up makes the counterfactual very easy to imagine in rough outlines, and thus more and more appealing.
But that's a fool's errand. There's absolutely no guarantee that in all the alternate timelines where you had not sold you would be better off now. Even with all the extra money. Windfalls tend to cause problems for lottery winners for example.
I mined 12 BTC from my gaming computer dual-booting between Linux/Windows that I also used for SETI@Home and Folding@Home, I ran the miner just for fun as I thought it was another distributed system doing computations and was fascinated by that concept at the time.
They were lost when I had to re-install Windows to play games and formatted the whole hard drive. I don't think much about it because it's so long ago but I'd have enough money to start realistically considering to retire...
Still, I did get a payout from the mtgox disaster and its a decent amount really, considering I put in less than 100$ from the start. Just far from life-changing amount, more like "ok, this gets us a nice vacation trip!"-money.