I don't understand why other people will choose to sell even though they are aware that the price is still low. The only thing they are going to get are losses. Instead of selling due to fear of losing, it's always suggested to hold your bitcoin for a while, until the price go back up again.
One of the reasons of why that happens is that panic has taken over them, they are no longer thinking in a logical way, they are letting their emotions getting in the way and once you do that you have already lost control over yourself and your money, this is why one of the most common advices is to always control your emotions when you are trading or investing.
It is a bad choice to sell now and is the utmost foolishness because you are in loss and you have to understand that it is a long term investment which will payoff in a high market. So wait for high market and do not sell now instead of buying more. You will be in much benefit if you make a nig collection of coins, once you get success in leading this collection into a high market then all the success is yours.