Theatre tickets are starting to resemble airfares, and not just because they’re ridiculously expensive. Generally, when we go to the theatre, we expect to have paid the same price as the people on either side of us, but increasingly, Broadway producers are charging less for ticketbuyers willing and able to make their purchases well in advance, and even less for folks willing to be flexible about where they sit, and what date they attend the show. “For complete control — the ability to choose your seat and the date you sit there — you will probably pay top dollar. In most other cases, you can make a deal.”