Should message board staff be rigid and rule-abiding, or should they take a few liberties and have fun with the whole thing?

Basically, do you think moderators and admins should be professional and responsible - just like in a real job - or should staffing be a fun activity, meant to contribute to the enjoyment on a message board?

Personally, I'm a big believer in the importance of setting a good example and maintaining high standards, without being excessively strict. MBs are meant to be fun diversions from the rigmarole of real life, but too much goofing off leads to a spam-cluttered, unenjoyable environment, as well as inevitable accusations of hypocrisy or favouritism when the regular members get penalised after following or question the lead they are shown by those with power.

Discuss, please - just for curiosity's sake.