Aaaaah!
I remember my good old days in World of Warcraft when you could sell Gold for money.
It was the sole purpose I'd play it.
I would speculate with Ores in the Auction House, buying the whole supply and reselling at a premium.
Plus I had a huge leather business. Spent my days collecting boar leather near Ogrimmar.
I was only lvl 30 and never ascended pass that, but man did I have fun in my own way.