Sadly, yes. Some don't think they are alcoholics but are ordered to be in meetings (I am thinking of one great guy in my home group who just can't quite get through Step 1). Some are testing the waters with sobriety, in pieces....I am sure there are other reasons. I for one attended one meeting hammered (I even got into a fight about bringing my dog in) - I knew I needed help but at the same time sabotaged myself.
For me, these folks remind me not to judge, how to focus on those who have what I want an not what I don't, and to do my part to let the rooms be a safe place.