Especially in a long thread, containing multiple "GUEST" postings, we can't always tell how many different guests are participating. It can get confusing trying to keep track of who is responding to whom, etc.

That's my *only* objection to fully-anonymous messages. I don't need to know your age, gender, etc. I'm generally much more interested in the content of these messages than in the personalities generating them -- unless, of course, a message is itself personal in some sense.