As New York’s Fall for Dance sampler demonstrates, there’s a big audience for dance if it’s priced and packaged right. But what are arts organizations doing to lure those people who might be interested but aren’t yet ready to commit major money to attending? “It’s understandable that theaters want to reward their devotees, especially as they typically constitute half the audience. But what’s keeping the venues from encouraging more people, besides students, to become devoted? Why, for example, are there no introductory offers?”