Thanks. I used to be registered at Coinbase with an unfunded account just to watch the trading, but then they kicked off all the unfunded accounts. Do they now allow short sales? (they didn't when I was on there).
Re shorting, it would be mainly for entertainment with entry points decided by gut feel. Also, I can be as fickle as the next guy and might even go long sometime. But overall, I still think it is mainly a niche solution for very specialized problems -- money laundering, drugs, perhaps some capital flight, mostly Chinese. All that makes for a very fragile core of support. Of course, I believed the same thing when the price was $200 a coin, so that does give one pause. Also, the market cap is still only $17 billion. Well, there are certainly companies trading with larger market caps -- that have perhaps less of a rationale for existing! p.s. I see the rules to even access the margin account features are here. So, if you want to have an individual margin account without a hedging purpose, you need to have $10 million+ in investments. Or, you need to have a business purpose for the bitcoin trading. Hmmm ... I think I will keep waiting for the ETF.