Here's my personal opinion on bannings and returnings. It does not necessarily reflect SC's views on the matter...just how I see it.
The moderators at SPCNET try to be fair to all members. SPAMmers aside, we generally don't ban members until a long pattern of uncooperative, disruptive behavior has been observed. The moderators typically discuss a member's problems for a period of time before considering banning. Sometimes, this process goes on for months.
After a ban has been decided upon and carried out, however, the intention is for it to stick. Banned members should have some integrity and understand that they've been excluded from the forums because they were unwilling to observe the relatively few and not especially stringent guidelines that we have.
Banned members should reflect upon their own behavior and understand why they've been excluded. If they want to return, they must make a sincere effort to cease the kinds of behaviors that got them banned in the first place. If they succeed in doing this, chances are they won't get banned again because they won't even draw moderators' attention to them. Moderators aren't omniscient. If members don't act like troublemakers, moderators have no reason to scrutinize them (we do have lives, you know?). Typically, ban evaders who get caught are those who come back immediately or very shortly after getting banned and engage in the exact same kinds of behaviors that got them banned to begin with. For the record, these behaviors are not limited to constant obscenity, baiting, and flaming, which are obvious "no nos," but also constant posting of material of no substance. In other words, non-commercial SPAM.
So that's my view on this matter.