Hello
Since GBTC is $500 each and other BTC exchange is $250 each, can I buy from BTC exchange and sell it to the GBTC

?
If can, then how

?
If cannot, then why

??
Please, anyone
No, because you're buying SHARES not bitcoins.
Sorry, but I still do not understand, who is selling right now? how did they acquire the share to sell? and why dont the buyer buy cheap $250 instead of buy expensive $500 ?