It sounded interesting to me too (initially) don't get me wrong. It can supposedly be melted, it can also get damaged pretty easily and most importantly, there is no way of verifying I'm buying what is being advertised.
The FAQ is all marketing and nothing of value, have a look. The "can it be faked" part gives it all away. There's nothing to do with gold, you trust the company and their "patented technology".
More options are always better, this is not one.
We used to have that for a while, a few years back, and it was great. They dropped it though shortly after because aBuSe. They thought we wouldn't abuse it for some reason.
It was supposed to be a one time code for YOU to withdraw withoud having to bring a card BTW, not other people.