This is understandable, if you join the trading world this is normal. Prices sometimes goes up and sometime goes down. "Buy low and sell high" it is all about how much money can you risk. I know it is for panic. But it can increase again at least at the price they bought the bitcoin you said. It's so much tricky, so must be careful every time.
I have seen some altcoin was disappeared when its price crashed down. But yeah I believe it wont happen to bitcoin. Well I think trading is not my area 
I cant be patient to wait its price goes up or down and it sounds boring for me, no offense 
Good luck man. I prefer gambling, atleast I can get fun there.Gambling is not always lucky, nor supportive to everyone except to those who never stop trying, everyone wins something big sometimes, but you don't know when.