BTC crashed primarily because the market suddenly got flooded by Bitcoinbillionaire :
http://arstechnica.com/business/2013/04/bitcoin-crashes-losi...
This bares repeating...
The value of BTC is in the nature of the transaction; not the currency itself. People have turned BTC into a commodity instead of actually bloody spending it. Their old fashioned thinking still ties it to traditional fiat like a smoker trying to give up the habit.
Look, I don't want anyone to lose their money, but people have to stop thinking of BTC as something that has value. What's valuable is the transaction itself, not the means of transaction. To put it another way, fiat currency is just colorful paper until it gets distributed to banks and into your hands.
This original transaction and all future transactions give it value; without it, the paper means nothing.
Edit: Spelling. Ironically, I wrote "bears repeating" instead "bares repeating". BTC ain't a bear market ;)