Scan the Auction House for arbitrage opportunities. Sometimes players put items up for auction at a purchase price lower than what the stores will pay to buy the item from you. Find these arbitrage opportunities and display what profit is to be made.
Also, scan the Auction House for good deals on items that my characters need. Sometimes players dump items for lower prices than my characters would have to pay at the stores. Or, sometimes hard to find items appear at good prices. Find these and display them.