"members often post as guests" some do...mostly it is for humor, or to tease or to ask a delicate question.

The few who abuse this ability are often quite a problem. I gather the main moderators can usually sort out which is which, and deal with them when necessary....but it is VERY time-intensive work for unpaid staff. It would sure make it easier if there were SOME sort of filtering process and/or waiting period or limitation of type of post.