So casually running a heroic dungeon for your pre-raid BiS as you do, scraping by and i come into 3 players from the guild “Simulations” and what do you know my pre raid BIS trinket drops, nothing was said about any loot being reserved, their ret paladin Sysity and their prot paladin Sylorythil decided they were going to need roll on it just to abuse the loot trade system, like cool i get it this happens, but when their whole guild is whispering you validating this kind of behaviour, absolutely disgusted people are abusing this system.
This is definitely happening to other people as well. Unfortunately it doesn’t really matter. Nothing will change. Yeah, it sucks. The only thing I could recommend is running master looter and creating groups yourself, then /roll on each item on bosses to avoid this situation again.