I agree that it's a pretty crazy idea, but just to play devil's advocate, I actually CAN think of one scenario in which I might consider doing this:
Let's say I was in NY for a very short amount of time, and 2 huge stars were giving career-defining performances on Broadway simultaneously. Neither of them have performed onstage in the past couple decades (I'm 21), and they are about to retire permanently. I might do it just for the opportunity to see both of them perform live one time. Sure, you'd only be seeing half the show, but if the goal is to see them both live, you would be definitively accomplishing that goal (you can't HALF see someone live, unless you have vision problems).
Food for thought!