But the item belongs to the guy doing the "undercutting", if he is happy with the profit he makes why should he be worried about the profit you make.
And that doesn't mean I am trying to screw you or even thinking about you at all... There might be some trink I want on the AH, I know I have a few stacks of Gems in my bank I have been sitting on for a rainy day, so I go cut em up and sell as many for whatever price I need to buy my Trinket. I'm not a gold collector, I am not trying to get to some limit, I want to make the money I need to buy what I want, they are my items I should sell them for what I want.