> Lots of assets have value without people buying things with them. Gold, houses, stocks, etc.
That value is predicated on the notion that they're worth something to the holder apart from their market price.
Gold can be used for jewelry and electronics manufacturing. In that sense it is a natural resource.
Stocks are shares in a company that runs a business or multiple businesses that could be profitable. Companies have financial obligations to their shareholders.
People live in houses.
Bitcoin's only function is to be exchanged. If no one is willing to give you anything for your bitcoin, it is completely worthless-- maybe even less than worthless when you factor transaction costs. The idea that it is a "store of value" is still predicated on bitcoin being a viable and accepted medium of exchange.
This is different from a house, which you can still use even if no one will buy it.
This is different from gold, as it is very hard to imagine a scenario where absolutely no one would buy your gold for at least for manufacturing.
This is different from stocks, where the financial obligations to you can only be cleared by legal proceedings such as Chapter 7 bankruptcy.