And what exactly are you going to earn from all your "minions" running ppl through HCs ? Will you charge them for being their "boss" ? Why wouldn't they just form their own groups ?
With this feature 4 friends from 4 servers can decide to purchase this for a month and get, in my example, 20k a day. How would that affect server economy when they can buy everything they want ingame ? Moreover, it seems as they pay for an opportunity to get rich. Any time they want.
If you are on the same server you will have 1/4 the clients you could have if you are spread across 4 servers. Simple math.