Those upstairs look down on gold. Gold can be smelted. There is a great demand for TBC to develop skills similar to jewelry processing, and mining can smelt gold ingots with long skills. And because gold production is relatively small, it is generally more expensive.
The landlord can go to the auction to see the price. Recently, more and more people play WOW. There are more and more people stamping forging, engineering and jewelry, and low-grade materials are easy to sell.