why no one told me $gbtc closed at 520$ 
That's an amazing price difference between gbtc and regular and real btc, and so far, I have not seen nor read any meaningful explanation regarding why such considerable price difference exists between gbtc and regular and real btc except that people (investors) are so BTC volatility adverse (shy) that they invest in some investment vehicle related to the stock market, gbtc, that they "know" - rather than one that they feel that they do not know, BTC. h
however, ironically, the ongoing considerable price difference between gbtc and btc seems to create an additional uncertainty regarding the continued price "stability" of gbtc, which to anyone knowledgeable about BTC would rather own real btc rather than the paper imitation shit of gbtc... in spite of apparent arbitrage opportunities.
Keep in mind you can hold GBTC in your retirement account. It is possible to set something up to accomplish the same thing with raw BTC, but it is way more hassle than it is worth unless you have a very large retirement account.
O.k. maybe I was a bit too confused about the abilities of an investor to get in and out of GBTC because a couple months ago, I had communicated with someone regarding GBTC,and I had the impression that he had more flexibility to get in and out of GBTC, but that may have been a mistaken impression.
I do understand that there can be some differences with retirement accounts and abilities to move funds around between eligible investments within
the accounts.
The whole GBTC price matter still seems very bullish.
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