you still haven't answered the question about a centralized vulnerability of gold storage.
I agree there is a risk that the centralized backing may fail. There is definitely a risk. You may think it is a huge risk. I may think it is a manageable risk. However, I am not trying to argue the size of this risk. What I am trying to convey is that with Goldcoin there is at least a possibility that the goldcoins will be backed by gold. My point is that even a small probability of being backed by gold is better than a zero probability of being backed by gold.