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 .
Simply because they just want to get a good profit. We all know that we all have our own needs and it is for us on how we wisely manage the growth ofbour earnings. As for me, people dump it because all have their own needs and plans for it and it is just for them to decide about it.