A chart showing gold prices is cute if you start it in 2008 or 2009. If you show a chart of gold prices since the 1950's or so- you will wish you had a way to short it right now. Long term, historic returns of gold are 1-2% (aka inflation.) A 50% rise in one year is what we call a shorting opportunity.
Here's another way to look at it- and I quote a wiser investor than myself, Warren Buffett, if you could build a square block in Manhattan of pure gold at today's prices, you'd have enough money to own all American equities.
Meaning- which one is overvalued- the square block of gold, or ownership of every single company, their earnings, and future earnings?
I'd take the equities over the gold.
And, if anyone ever tells you why you should invest money in a commodity, and their investment rationale involves their personal politics- do the exact opposite of whatever that person does.