I've only seen two "Guest" members and both were normal members in the beginning. Thus, they had a profile.
Then they begin acting strangely and not responding to other ET members.
Next, they no longer wanted to be a member and something was worked out between them and ET management that allowed them to be "Guest" member.
I think it allows them to return. It doesn't make any sense because a member can limit the viewing of their profile without being a guest member.
Thus, there's something else going on outside of the viewing of their profile, contacting them, and so on. Maybe, ET itself can no longer send them messages like "alerts" and a guest member can no longer log in until they're ready to become a full member again ???
wrbtrader