You know that sick feeling you get when you find out that the guy in the airplane seat next to you paid several hundred fewer dollars for his ticket than you paid for yours? Well, increasingly, you can now get that same feeling in your local theatre or concert hall. “Sold-out houses — houses that are really sold out — seem heading toward the same extinction as hand-torn ticket stubs. For those willing to pay, in the future there will always be seats, just as there are always full-fare seats on a peak flight.”