Is This The Greatest Bitcoin Arbitrage Ever?

With GBTC trading at a 100% premium to the price of Bitcoin, the underlying asset it's supposed to track, the play is to short GBTC and buy Bitcoin.  The only problem is it's next to impossible to short GBTC since there's no inventory available.

http://www.zerohedge.com/news/2017-05-30/greatest-bitcoin-arbitrage-ever

Risk Free Precious Metals Arbitrage?

Nah, there can't be any price suppression with COMEX gold contracts. 

http://www.zerohedge.com/article/risk-free-precious-metals-arbitrage

One picture explains so much. One is the Comex Gold contract, the other is the Hong Kong traded one. One bid is above the other's ask.