This reminds me of Warcraft. I got this PDF listing which products were cheaper to buy from vendors than the auction house, and I set up a small network of toon

This reminds me of Warcraft. I got this PDF listing which products were cheaper to buy from vendors than the auction house, and I set up a small network of toons who would mail each other these products and auction them. (The products were either all fish or mostly fish.) I think you could have five characters total, so I had a little price triage cartel specializing in fish, made up of four characters, who all operated for the benefit of the fifth character, the one I actually played the game with. It worked beautifully up to about level 45 or 50, after which it didn't scale any further.