As long as bitcoin is seeing these huge crashes for no real reason, it's not a mature investment vehicle. There's absolutely no valid reason to sell right now, this crash is just driven by panicking people. I think this is mostly because too much wealth is in the hands of too few people, and people who never really traded before (techies, mainstream people, novice traders, etc.) now invested in bitcoin, and try their hands on trading.
I hope all this panic selling will lead to a better distribution of the bitcoins, so that it may become a more stable investment vehicle. These random huge crashes aren't doing bitcoin much good. People want stability if they are to accept this as a currency.