Basically what Radaghast said, lotting in level,behest,grind partys is not the issue. The issue is when say a 100million gil extremely rare item from a epic raid boss drops and it goes to someone it is not suppose to get it yet, lets say there where 9 people infront of him on the item since he was a new member to the ls, the item drops on average 3 times a month. He has 3 months to wait and he knows it. Is that item really his? The game gave it to him but he was not up for it. That member has to make a decision that it is the item he joined the ls to get, it is now on him does he keep it and bail on the ls he really is not attached to yet, or give it to a leader he just recently met.

The issue is he can quit the ls with it, steal a 100million gil from the ls, and the GMS will just say well it dropped to him it is fair game. I had this happen with Walk of Echos with one of my members on XI, it had a lotting thing similar to FFXIV's where the lot pool was community and it went strait to that person, even though it was a team effort.

Some system has to be in-place where the leaders of the event have full control over who gets it, the current system has no such controls.