I would love to sit here and debate this with you, but I have a Saturday lunch meeting in a few minutes with my old high school's football captain and prom queen. I hear that they've accomplished some amazingly valuable things. We're probably going to eat at McDonald's. We will probably spend some time discussing the latest Dean Koontz or Danielle Steele novels. After that, I will come home and watch Fox News for a few hours, followed by some sitcoms.
Gosh, it's a good thing all these are so popular! Otherwise, I would have no idea what was valuable and what wasn't.
Oh, and by the way: gold would not be worthless. It has certain intrinsic properties -- like its resistance to corrosion, its malleability, its conductivity, and its low melting point -- which have made it valuable for many uses.