Maybe gold naturally will be good as investment, people who trade it only take advantage from it's price that keep increased in time.
Gold has relatively speaking been a good investment if you got in below $1000. It took Gold 5-6 years to break the resistance level that was preventing it from going higher due to all the (unbacked) paper shorts. Imagine how long it will take for Gold to break through its all time high. It might take decades without investors looking for a safe haven.
Also keep in mind that Bitcoin is a capable competitor that will usurp a big chunk of that safe haven capital. I wouldn't put a single penny in Gold unless you think all fiat currencies will implode and Gold is the only form of value that will hold strong.