In your opinion what are the reasons that let someone start dumping his bitcoins and walk away ?
I personally (and this is just my opinion) that it's more panic then simply his need of money or something else , as we saw on the BitcoinXT last time , people started to panic and simply sold their bitcoins and that caused a drop in the price .
there are several factors that make investors withdraw their funds in bitcoin because they have already achieved their profit targets and / or they are in need of funds for real-world needs. Price reductions often coincide with big days or holidays