Ya sure. But there might be some rules existing for the editors and moderators which we are unaware of.
It goes without saying that editors and moderators have to be more punctual than other members. Other members are bothered about only self contribution. The authors look for early approval of their articles and points/ cash. Unless the editors are regular, the authors will be discouraged. similarly, some moderators are assigned job of various awards and competitions. Unless they are regular, there will be delay in declaring awards and some times, these may be even improperly given in haste. We do not need rules for the norm of regularity as this is very obvious.