Well gold is pretty different. We can mine more of it. And there's mines that we know where it is, waiting for the price to go up, for it to be more profitable to actually mine. So if the price of gold doubled, we would mine at a much faster rate, causing more to hit the market, lowering the price.

When the Bitcoin prices goes nuts, there is nothing we can do to produce it faster. Which makes the price go even more nuts.