Solution to the LFG tool problem.
Its not only sellers that get griefed, everyone that is in the middle of a path and post on lfg can get the instance killed by that. It happened to me once when i wanted to run arah p1 for my dm, i soloed all the way up to the tar then posted on lfg, 3 people joined but on the last slot the group got merged, i got kicked from my instance and ended up in another totally different group.
So if you are doing a long path like arah p4 for example and need one more pug at the end of it you have a high risk of getting griefed.
One thing that i find weird is that i never heard of people getting the instance killed in fractals, i dont know if its because no one has ever tested it or if fractal instances are immune to that bug.
It’s probably much more rare in fractals because 95% (my estimation, but probably more than that) of NA griefing comes from one guy. That guy happens to choose arah as his favorite. And like Casmurro said, if you lose a player mid-run and post on the lfg, you run the risk of getting griefed. If there’s a sell instance that must be destroyed, this guy won’t hesitate to use a random party to do it, thus destroying both instances.