From what I've seen, you can use one of the few legit gold-buying companies who will buy for a medium price and resell it for profit.
This nets me about 1.00-1.20/1000g.
I've tried to make a thread to sell straight to players for 1.50-2.00/1000g, but I get no responses...
Anyone have a company that pays more?
Or a site that has people connected to buy and sell?