As an experiment, time travel back to 1930s Germany and try to buy a loaf of bread for about the same amount of marks that it took a few years earlier. I don't own gold to spend at the grocery store, I own it to use when the dollar hyperinflates if it does. Try taking your real estate deed to the grocery store and see if they can use it to buy groceries. If they can't, would you say that your real estate is worthless?
As an experiment, time travel
I figured you wouldn't dare try to put your theory to the test.