Bitcoin is a digital currency so we don't need any real thing for that it has been valuable because of it is a digital currency and being a Crypto currency is more useful for anyone to get easily connected with it digitally.
therefore the value of digital currencies like bitcoin is always expensive because bitcoin is one of the currencies that people will use to transact the online world
I think if bitcoin can only be used in the online world it will make bitcoin not grow and certainly the price of bitcoin will not become very expensive because demand does not increase, bitcoin should be used for local or offline transactions so that many people try to use bitcoin to complete a payment.