I don't like dining alone - i just feel weird doing it. I used to do it for a while when i had a job that paid more then I needed and thus on lunch i'd spend crazy amounts of money trying out the nice places in the vicinity. That phase only lasted until I had tried every restaurant in that area.
I think lunch maybe isn't so bad, but i dunno why but I will avoid eating dinner in public alone like the plague. I just feel... "alone" and sorta loser-like.