I thought about implementing a post minimum but as JK-27 said, if it was 10 posts, people would just write meaningless posts to get to 10 like, "Nice glasses", "Sweet", and it just would't be worth it. Yes, there are a lot of people who only make one post, but we also attract a lot of new members who will stay with the contest. And we monitor the posts IP addresses to make sure no one enters more than once. If they do, they are automatically disqualified.