As your gold pile steadily increases, keep in mind that you are now significantly higher than the average player who is likely to have only 80,000 gold or less. Why this is important to remember in your gold-making endeavors is because you may be tempted to try and gouge your customer base for every copper they have; keep in mind , though, that they won't be able to afford items if the prices are too high. Generally, as the price of an item falls to more affordable levels, the demand for the item increases as more and more players can justify the purchase. Eventually, the price and demand will stabilize to find an equilibrium that the economy could theoretically support indefinitely.
Keep this in mind, especially when working with big-ticket items such as mounts and Bind on Equip gear. These items with larger price tags can only be afforded by a small portion of the server; an even smaller portion will be interested in buying them. (They didn't get to the level of wealth...