What's totally weird is that no one has a decent explanation. Those 5 "reasons" are as good as none. Since I learned economy in the end of the 90, it's the most intriguing economical event I came across. Internet firm bubble and collapse was normal. Sub-prime crisis was pretty logical. Bitcoin was an old trick. But lost faith in gold is pretty amazing in it's implication, and it's without any precedents.

The interesting question : Where will go all the liquidities, those billionaire just took off the gold market?

Edit: It seems it's basically market manipulation. But manipulation on gold is so hard to pull of (so many people have an incentive to hoard gold) that there must be something really wrong with the market at the moment.