Since playing the market is the only viable way to make gold at a reasonable pace, how about if we get experience for making a 15%+ profit off sales? This might encourage people to list their blues a bit higher, too. Should also award experience for trading gems -> gold, etc. Power traders can level their alts to 80, and the rest of us can benefit off being able to sell blues and other things more than 1 copper over vendor price.
Experience for TradingSource