Luckily her at our local dances, (NH), dancers are encouraged to seek
out newer dancers and folks that appear new to the dance, this fosters a
real community feel.
More to the subject; I was at a dance to the south of here and if I
wasn't asked to dance ahead, or booked ahead myself, I would have
watched from the sidelines.
I think this is ingrained, and accepted practice at certain dances. I
don't think there is much a caller can do to dissuade it. Dancers are
going to do what they are going to do. The best a caller can do is try
to set a good example, toss out the style points and, and try to present
the best dance experience possible. (also push those smaller dances
where booking ahead isn't so prevalent).
Thanks
Gale