[TimPC]

I'm going to take the cynical view here. The issue is that there are rules around movement and use of cash that are clear that banks can follow to say 'not my fault' when terrorists use cash. No one knows what's illegal and legal for the movement of bitcoins. No one knows what compliance they need. How does investing in a currency where the regulations are likely to dramatically and suddenly increase in certain unpredictable ways play out? Can regulatory changes cause a huge amount of volatility and downward pressure?