lucy24 - 8:58 pm on Mar 4, 2012 (gmt 0)
Can you safely assume that your winners are people who travel?
Seems like you'd want the prize to be something attractive to the specific people who are most likely to enter and win the contest. Do they have :: cough-cough :: lives? Do they spend all their time sitting in front of the computer? Are they likely to belong to some particular demographic group? Does the competition involve some shared interest?