The problem is there aren't new, good, thought-out servers. (I think there never has been even one)
Everyone sells the ability to give yourself every item the server has to offer, spawning mobs and most servers are unbalanced as fuck, drop rates need to be thought-out, new, improved monsters/enemys, a lot of weapons that change the way you play, but not in an op way. There is just sooo much time and thinking involved, that is why Phoenix Reborn is gonna take a fair amount of time, even tho it has alot of developers, you first need ideas inorder to code something. Also there aren't as much new people as it used to be back like 2 years. The game and every private server ever is like a dlc. The basic game is prod and what you get are like 2 more dungeons 20 items a new nexus and maybe a new minigame, wow, that's like 2 hours more fun until you grind the fuck out of the new stuff. You basiclly would have to change all classes, dungeons, the layout inorder to make a new experiance with the old and known loot system.