I too am a true believer; However, it's not fun watching the 75% haircut.
Yes I don't see why it is bad to sell all your BTC and 2 days later buy it back, but back 4x as much with the same amount of fiat. That means you have quadrupled your BTC wealth in 48 hours. It is just unfathomable to me why so many people are against doing this. Oh well to each his own and have fun.
Selling it
all would induce serious subsequent self-kicking if the price never dropped from that point! As for adjusting one's position (never selling
all BTC for the reason already given), selling to bet the price will fall, there's nothing wrong with that at all but it is a gamble. Most of my
BTC is in cold storage so will not make it onto any of the (dodgy) exchanges, but I have turned a small profit from speculating the LTC/BTC cross on BTC-e.