I know there are other places that have poser lists and forums and stuff. are you going to make the contest available to them as well? I think you'd do better just throwing it open to any and all poser users. you're going to get plenty of chances during it to give out the link to your store and stand a good chance of getting new customers who never even knew you existed that way. you're not likely to get any new customers if you restrict it to current customers only.