That implies having cheap mats and if mats are cheap chances are he will buy them off the ah 2. Even when he is farming you are not guaranteed a sale simply due to the fact u don't know if there are people interested in most of your items. Relist doesnt work if he has mats 2 just craft more given u just bought out most of his items. Usually people who engage in these sort of activities have an ample network set up so i doubt they run out of supply or money given they probably got some bots or spend most of their days farming. It's impossible 2 deprive someone of supply unless u know where it comes from. Again profit means money u keep after u deduct mats cost and if you buy them but if they got bots farming they are always on profit no matter what.