I work in social media and we wanted to make a contest in which one of our fans or followers could win a dinner at a fancy restaurant in town. We would take photos of them and upload those to our fan page. At first, the client was thrilled. However, they called later to say they were not going forward with it. When asked why: 

Client: We just don’t want someone who looks poor to win. It could seriously damage the reputation of our brand and the restaurant.