Hmm, how about that. An oz of one costs the same as the other? Problem is you can keep gold around, and nothing happens with it. It just sits there. Marijuana on the other hand, never lasts. Even if you do have the discipline to hold onto it, it decays in time!
Gold is pretty much forever. A plant is just a plant. When gold is scarce it goes up in value. When pot goes up high enough, other suppliers and growers will come in. $440 for an oz? Better be really, really good. Particularly since it all goes up in smoke!
Of course, you won't get arrested for holding Gold, although they may try to take it from you. With the other, they'll take it and you away.