You cant expect not to have favoritism on private server with thousands of players online.
Most if not all GMs play here,and you can rest assured they are not in some random guilds,where everyone has the ability to invite anyone.
I was a GM here,back when this server was originally Neverendless.We had like 15-20 GM's online at any given time in our hiding spot in Elwyn Forest.
When you talk to hundreds of people each day,answering tickets,giving out their donation coins,items they donated for,talk to them for a bit,do that for years and you gonna have few friends.