On Balmung the norm for farm parties is each person calls one item, the item is then locked to that person. Usually its a max of 1 person per item, so its first come first serve on calling the item, but its not like leader is only one who gets to lock one, the greed is just for anything not called by anyone. Is this what you're referring to or are you saying there's a bunch of parties where only the leader gets to lock anything?
We usually put the most popular items in PF announced as "locked" if someone's called it, just to limit the amount of people who jump in, ask if thats still open, then immediately leave since its not (which is fair, I wouldn't join if the item I wanted was called either), which I guess could be misinterpreted as only those items being locked if phrased poorly.
If it is people posting groups where only leader get to lock items, I'd say just ignore their group and join a different one. Seems to work over here, as anyone trying to be selfish about the loot rules tends to have their PF either fill extremely slowly or not at all. If its groups where everyone gets to call an item, I don't see the problem with that system. Heck, I prefer it since I don't always feel as comfortable with the fight on what I want gear for as I do on my main jobs.
