Why do you guys so vehemently commit to buy and hold, only to blow it when it's at the very bottom and sell?
If you committed to buy and hold on the way up, what it SHOULD mean is that you have already psychologically braced yourself for any sort of drop like this. You've probably decided you're not good at day-trading, so you hold. The problem is it's very easy to commit to buy and hold when it's going to da moon, but will you maintain that sort of mentality when it is dropping like a stone? If you cannot do so, you should probably have cashed out enough while it was going up so that a drop wouldn't crush you. You know it will go down eventually, whether it be in a bear trap or a crash, so if you really want to stay in bitcoins, just save the proceeds from your bitcoins until it goes down, then buy some more.
For some of us, it's an insane amount of money. You can't help but calculating buying a nice house in Tuscany with a boat to sail or just holding.
EDIT: With Buy and Hold it's a house in Tuscany. With playing the lotto with the Chinese, it's maybe a House in Tuscany PLUS the same amount of bitcoin you just spent on the house in Tuscany.
EDIT: The majority of my stash is still cold, cold, cold.
Were you the one who said you lost more money than you've ever had during this drop? If you sold portions after large advances instead of large declines, you would have had a lot more money, and wouldn't have to have that lurching in your stomach during drops. Now, if it continues to advance after you sell some, you will miss out on some profits, but you'll still likely make plenty. If it starts to drop, the money you have accumulated will help you keep your head on straight and not panic when a drop comes. That means you're going to be sticking to your original buy and hold plan. It also means you will have extra money with which to BUY when it's dropping.
I think for some of you, it stems from greed. "If I sell 10 BTC now at 1000, that's 10 million less I'll have when it hits 1 million!" I promise you it's not going to go to a million tomorrow. Take some profit during uptrends, buy yourself something nice, and hold onto the rest for rebuying later.
One might argue "well if your plan is to buy and hold, why are you selling?" Well, you're temporarily adjusting your plan to involve selling because you want some profits and you want to reduce your risk to prevent panic selling. The question is, are you going to adjust your plan rationally while it's going up, or in a panic when it's tanking?