I can't imagine many things more tedious and boring than running a MMORPG on multiple computers at the same time. Maybe the DMV.
I actually run both accounts windowed on the same computer, running on two the way I do it would be completely impossible, especially with my melee characters. I make no secret of having two accounts at once, like these two, Insolent Night and Insolent Day.
Two accounts for City of Games are just fine, you play two you pay two, and have a nice day. I've had GM's ask me about issues I've run into with certain doors and path following for my second player, and no one has said a thing.
Occasionally some folks at first say that they don't believe someone could run two at once well. I then offer to either leave now, or if they see me in one mission if they want, I'll leave then. After a mission no one has asked me to leave yet. I have had folks say in PM's that they really believed us when we said I was one person "LOL".
This gives me extra room of storage for crafting, more funds, and when I can't sleep and it's one of those missions where a switch has to be thrown on two sides of the map at 3 am, a second set of hands.
I don't see how I am causing someone else to not have a good time, or would be affecting anyone in any way other than getting them more loot with more enemies on the mission since I am bringing 2 bodies. This is why I don't understand the "OMG Dualboxing Haxxor! WTFGTFO!!! Ew ew ew ew UNCLEAN!!!" response.
I'm not saying it's for everyone, nor that I am better, I just want to know why the hate.