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Gold is maybe the most universal shorthand there is for value, and for greed. The ancient Egyptians were obsessed with it. European explorers marauded through South America in search of it. And American cities like San Francisco and Seattle rose to prominence because of it. It's a big part of our history as humans.
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Looking at all that, our obsession with gold also seems historical, sort of old timey - but that's not at all true. There's still huge demand for it today - the recession of 2008 helped gold quadruple in value. And a full half of all the gold mined in the world has been mined in the past 50 years.
Read more about the history of gold:
Forbes: How Many Olympic-Sized Swimming Pools Can We Fill With Billionaire Gold?
National Geographic: The Real Price of Gold