One thing that's been almost completely overlooked is market macros. I don't know that much about making macros, but how hard would it be to make parameters such as "If there are >X of an item, buy until there are X" All you would have to do is give a lvl 3 account a couple million dollars and send it on its way. I can't be the first person to think of this, because I've seen people standing in the same place buying from a store for several hours at a time.