I tend to look at the neck a lot.
i always have and I find it takes some positive effort to look away and check out the audience, irrespective of how simple the line I'm playing might be - I tend to have a maniacal middle distance psycho stare when i do, mind.
Often though, the lighting tech has little clue and I find myself in pitch blackness, often during the most complex fingerings in the set.
Sometimes i wish for LED side dots