Isnt undercutting part of balancing the economy? If someone puts up a ton of stuff way low for the amount of effort to make/get it then you can buy out all their stuff and make a major profit. Then eventually the market stabilises behind a price right?

Sure it'd be nice if everything stayed at a million gill sale wise, but as patches continue and people jump into the market supply goes up and demand goes down, natural for prices to tank.