Right. There's only one person who can truly regret his decision with Bitcoin...
the guy who bought a pizza with like 10,000 bit coins like 8 years ago. Today, that's a ~$50,000,000 pizza.
I bought bitcoin years ago when it first spiked and then came back down... So I bought when it was $280/coin or whatever, but I sold when it jumped back up to $700 ~9 months later, because the year before, we watched it climb up, spike at $1200 and then crash, and I figured that was imminent. I was happy enough to double my money. Sure, I coulda sat on that another year as it climbed up to $2500, but tthen when it crashed last year and lost almost 50% of its value, I probably would have freaked out and sold then convinced it was going to keep dropping.
There aren't many people who would have bought bitcoin at $1 and then sat on it for 8 years only to cash out at $5400, or whatever. And, in 5 years, we may have a thread where Bitcoin hits a new record high at $30,000/coin or something, and then the same people will post "I Was going to buy at $1 and I missed out!"
It's just how currency trading is. There have also been plenty of dips and plenty of people who lose money. I've been investing in Ether and Litecoin over the last 9 months or so, nothing major but just supplemental investments, and I'd love to say that I always bought low and sold high, but that's not the case. I bought Litecoin when it was $28, and then sold when it was $49, even if I waited another month it would have peaked up near $90. So, what did I do? I bought some at $80 as well, and then it's dropped back down to the 40s and 50s for the most part for the last 2 months. I'd love it if I only bought low and sold high, but that's just not how it goes.
Here's the thing, we always think "MAn, I was gonna buy at $400 a coin and I missed out, I should have done that!" But for every time where you were going to buy at $400 and sell at $5700, there would be an equal amount of times where you'd buy at $2700 and then it'd fall down to $1800 and you'd sell in a panic, or you'd buy at $400 and sell at $650, etc. It's just how it is.