It is a lack of courtesy cuz they preyed on my naivety by pulling this Confidence Man tactic.
And this was a "YOYD" run. How is it a significant loss for them? It would've been a enormous loss for me whose only reason for going there was the the Behemoth Tongue. If the tongue had not dropped on my orb, I would've had to given my Shank to them and receive nothing from a "YOYD" run.
"Nothing from a YOYD run."
Cuz the only worthwhile drops from Horns of War is either Tongue, or Shank for another chance at Tongue.