I purchase 10 Copper Ore for 17c each. I then sell those 10 Copper Ore for 21c each. I make a very small profit. I decide to try this with other items in the Trading Post. I buy 10 Vials of Blood for 45c each. I then sell 10 Vials of Blood for 48c each. I actually don't make a profit and lose money. This makes no sense to me.