The thing with aluminum is it's like the 3rd most abundant element in the earth's crust. It's the process of extracting it that was difficult with older technology. Gold actually has a rarity. That said, I'm not a huge believer in gold, either. But then I don't have any. Of course, I don't have much of anything, dollars included. 
There's quite a bit of gold in seawater, if we found an easy way to filter it out, the market would probly drop quite a bit.
Also, I believe there's a significant amount in the earth's core, but we're not currently able to drill that deep.
Making gold is like cracking encryption, quite difficult.
Finding gold from an alternative source is like finding a defect in the protocol -- much more likely.