The value of any asset is zero if nobody is buying it. If that asset happens to be shares in a company making a profit for example, that means that the risk of

The value of any asset is zero if nobody is buying it. If that asset happens to be shares in a company making a profit for example, that means that the risk of nobody wanting to buy it (at any price) is practically non-existent in a real world scenario, sure, but that doesn't mean it has some magical, inherent value disconnected from the market. By your definition no currency in the world has any fundamental value, so what is then the point of even talking about it when discussing crypto currencies?