This is why Bitcoin cant have nice things. The unregulated digital currency beloved by techies, libertarians and the Winklevoss twins is having a crisis moment that could end its hopes to ever be accepted as a legitimate currency. Its busiest online exchange, Tokyo-based Mt. Gox, has been frozen for days, amid rumors that hackers have stolen maybe $350 million worth of Bitcoin wealth. The price of one Bitcoin has collapsed to about $500 on a rival exchange, Slovenias BitStamp, down from about $1,100 last December, according to Bitcoin tracker Coinstackr. …