Cool. I personally would snatch up all the underpriced items from the market, and then post them at smaller qty at a higher price to the market, also taking care as not to "flood" the market to create an illusion of scarcity while I still have a few stacks of the same item in my inventory. Also, I'll pull out from markets that are too saturated, and come back later at a time where all the 'cheap' items has cleared.