However consider that BIT is limited to "high net worth" investors and if I was someone with a long term interest in holding who already has 10,000 matured shares as a small % over my portfolio I would be tempted to :

1)  Buy 10,000 new shares at the current market rate (1,000 BTC x $235 = $235,000)
2)  Sell 10,000 matured shares at the best GBTC rate I can get (say avg. 10,000 shares x $40 = $400,000)
3)  Bank Profit ($165,000)
4)  Hold the 10,000 new shares for 1 year (again)

This assumes anyone investing has money in the bank they can spend immediately and they don't need to wait to sell their existing shares before they buy new shares.