This one one is clear: If you come into chat, and then don't participate with others..
Why come in?
To monitor?
lj's right here. I think it's an annoying habit. Not a chat bannable offense...Just irregular and annoying.
It's comparable to being in a restraunt, refusing to sit with your company, then stare at them from another table.
But there are many personalities that make up the cellar. Part of the fun of it.