It's only there to use after the warnings. Most bans should be temporary and as very last 'solution' to show you're serious about something.
I have banned as Forum Mod and never had ANY1 complain to me. It was always clear why in advance, and what was and wasn't tollerated. People will know when they stepped over that line and bring it on themselves. (i banned maybe 4 or 5 in a 3 year run, with more then 100 active people at any given time of the day!)
A ban-happy mod is never a good Mod. You don't want the feeling of dictatorship on the forums, just moderation
I may actually apply for this. Been forum Mod for around 3 years for RebirthRO. I just lost interest in the game itself and moved on. They never closed my Forum Mod account saying i could always come back... not even last time i checked after 2 years of silence. (lol) They probably just forgot about it though....