There's an innate human desire for gold. Humans crave gold so much that empires have been built and destroyed over it. That's a utility baked into the commodity. Many cultures hoard gold. Most of that gold will never be sold. Much of it is purchased for ornamentation and most of the time it just sits in a locker. In many cultures it is in fact considered a shame if family gold has to be sold.

Think of it this way - if there was no one to buy the gold from you, would you still buy the gold? Answer is yes. Many people all over the world would buy gold even if they could never resell it. The same can't be said about magic internet tokens. They have no inherent utility apart from the hope that a bigger fool will buy it from you at a higher price in future.