If you own an RPG, don't go mad with power. If you want to assign moderators of the group, don't let them all be other accounts you have control over, especially if no one knows that those accounts are you (that's called sock puppeteering). It's not fun if you get people to join only to declare supreme power over them, because that'll make you look like a control freak and it'll cause people to leave. Let the members of the group be independent and if they don't want to participate sometimes then let them be. Only talk to them if they turn down opportunities consistently.

Summary:
Be a responsible owner. Avoid appearing power hungry.