I agree with the OP, to an extent. I set up parties like this, generally: "A# Farm Party! Know the fight, No bonus, Stay until everyone gets loot (4+ runs)!" I had one person leave without loot after 2 runs because something came up (sucks to be him, but someone else got lucky), and most of the time my parties break up after exactly 4 runs, leaving 1-2 people having to do another entire farm cycle (or risk the DF) for their loot. That said, while I have yet to blist anyone for leaving my parties, I think it's bad form to join a party that says "until everyone gets loot" and then not stay for at least 1-2 extra runs if necessary. Remember, your unwillingness to stay for an extra 10-15 mins could cost someone an hour or more depending on their luck.

--Erim Nelhah
(Master, Astral Descendants <AD> Malboro)
(60 DRK Main)