I have heard of discounts for performing special feats, like Linwood Sassy's Screw You Review offering a discount to any one wearing an official Linwood Sassy t-shirt, but recently a show about a girl in love with an Orka sent me this tidbit:

2007: Guess Who’s Coming to Dinner has set aside two comp tickets for each performance for winners of our Love Story essay contest. Just write about a true love story that has ended well, 250 words or less, email to < ClarionRefugees AT aol DOT com > with your first and second preference for show times. Winners will be notified two days before the show they win.

I would assume they are going to use your essay during the show somehow... they didn't really say. I'm curious as to how this will turn out - get to writing those essays!