edit: I think I mean it's "use value". The value of gold if it were not used a store of value.
Even if gold loses favor as a value store, there will be some minimum boundary on its price based on its usefulness in practical applications. That is not true of bitcoin.
The GP was implying that bitcoin has a commodity value, which it does not. It merely has value as a means of exchange. What that means is that bitcoin does not benefit from same lower price boundary that gold does. Therefore, it is much riskier.
What good would bitcoins do for you after a Hurricane Katrina-like event when there is no communications network or electrical service to speak of? What about gold?
If that's true, 30/1600 is about 2%, yet gold is still perceived as a fairly safe store of value.
Also, the claim that "gold only became a currency when it was stamped" is wrong. The value of gold on the commodity markets today does include a value store component and none of it is stamped.
When the czar's family fled russia they didn't grab rubles, the grabbed jewels. Why? Because their currency was worth nothing but their jewels could be traded for value in a very transparent manner wherever they might end up.
In the case of bitcoins, they do not have a utility outside of their use as a medium of value exchange. You can't really melt them down and use them to make jewelry, build cables or any of the myriad other uses that gold has.