Either they are 100% sure that the price will fall at that moment or they are already contented with the value of their coins at prices at or even lower of that of the current price.

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I agree, some of them are day/week-traders trying to buy low and sell high. Also they tend to shift from BTC to LTC when one is more volatile than the order. It similar to trading stocks, trading BTC is not so different in that sense and hence very emotional!

Personally daytrading gives me an adrenaline rush, especially when your winning. But I tend to play low stakes and definitely not risk it all.