You may have a staff faction on the following conditions:
This applies for admins and above!

1) You do not invite regular players to your faction.

2) You do not raid or overclaim other people's land.

3) The faction is made into a peaceful faction.

4) You do not PvP with any regular player unless it is in an arranged instance (duel, PvP match, etc).

5) You do not ally or declare war on any factions.

6) You do not store unnecessary items in your base (stacks of diamond blocks and golden apples, etc). It is unneeded and plain idiotic.

7) You do not use powerboosts.