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Would you pay more (monthly fee) for your MMORPG if it meant that you could get several dedicated Dungeon Masters per realm who are putting in ad-hoc stories and encounters in game during normal play time?
Now, I don't mean massive game changing mods, nor do I mean insignificant interventions. They would just roam around the game, and could decide to add additional encounters to a group going through a dungeon, and add a few words here and there stating there is a plot twist. This could be really hard, or easy depending on the type of encounter, and the rewards would be granted at the discretion fo the DM depending on how "well" the group or individual did.
With the right set of tools, the DMs could add whatever they desired, and even, if they wanted, could assume the role of the MOB NPC and use its movement & attacks at will. With several DMs per realm (server), there would be a good chance that during a play session you could be the target or said DMs.
Keeping additional people under one IP would obviously cost more, but would this be something that you would pay more to get?