Right now you can't sell gold for as low as it is worth on the RMAH. So let's use this to make some real life money!
1. Buy gold from any gold selling websites you trust.
2. Sell this gold on the RMAH.
3. Profit.
If you buy one million gold for one dollar you can sell this for a lot higher on the RMAH. On the UK RMAH I can sell one million gold for 2,5 pounds which is a lot more than the one dollar I bought this gold with. I assume people will buy gold from RMAH, as most people feel this is the safe option for getting some extra gold.