Have you tried to do the math? Putting stacks of 5 for 250c each. That is 50 listings at 250c equals 12,500cr. That's 12,500cr!!!! Just search the GTN for Electrum, for example, on average it sells for 800-1200cr per unit but there is always at times some listed for under 500cr. Buy up all those and re list stacks of 20-28 for lets say 900cr per unit. That is 14k profit on average per listing. Multiply this by 50 and you make a minimum of 700k profit. This is just one material I'm speakign of.