The spread narrowed, but things have hit a relative standstill at 300 shares traded volume. Yesterday was 762.
The only sellers are
a) New BIT holders releasing their shares, a one time shot, after a 12 month holding period
b) Speculators that bought GBTC on Day 1.

The low volume suggests that at most 3 new sellers have pulled the trigger today, with $55 asks offering a 233% premium.

I have 50 more shares up at $133.7. The GBTC page http://www.otcmarkets.com/stock/GBTC/quote shows nothing below $175.

I speculate this game of chicken will resolve with volume staying low, positive Bid pressure. Those Bids will eventually pull more sellers out. Then we will have a bootstrap of liquidity - new buyers with varying entry prices. Those respective buyers will then make various decisions and help dial in to a true equilibrium, with a positive price trend.

Even if those sell, I would be holding the final 1/3rd of my shares.