The wine bottle

As a pet sitter I invariably end up in my client's kitchen at some point during the visit. Many pets are fed there and if not - bowls must be washed, water dishes must be filled. The one thing that puzzle me, however, --- in almost every kitchen --- on the counter, sitting by its lonesome is a wine bottle. Usually, it has not been opened. It just sits there all alone by itself and I wonder what it is doing there. Was it a house warming present? Is it there waiting on a special occasion or a romantic dinner? Will the wife open said bottle and begin drinking it while she prepares dinner or is it waiting to take the spotlight the night their friends come over? I then wonder if I am missing something by not having a wine bottle sitting on my kitchen counter. Does this make me a bad hostess? I do have a mini bar filled with wines, port, sherry, etc. for the discriminating palet, but alas no lone wine bottle on the counter. I wonder what I am missing...