On the subject of gold:
I don't get that either. People see gold as a standard hard currency, and here in the US there has long been criticism over the government's abandonment of the "gold standard" as the physical reality that dollars represent. But what good is gold? Historically it's been a currency because it's pretty and shiny and people like pretty shiny things. But I'd like to think society is evolving away from a concept of value that is based on "ooh pretty!", and toward a concept of practical value. Gold has little practical value. It's too rare and soft to be used in large quantities for most applications of metals. It's best practical value is as an electrical conductor, which is not as good as copper or silver but is less susceptible to oxidation. But there's nothing about gold that makes it inherently more valuable than any other resource we use. I'd say water has more inherent value.