I'm gonna say what others are thinking. Too many new members with 1 post posting within 30 minutes of each other from the same location. Maybe new criteria that members must be active for 30-days before being allowed to enter? Also if this keeps up we're going to need increased security with new member creation.
Not saying all are spamming new accounts just to enter but there are a few that are apparently obvious spam accounts made to enter multiple times. Could be wrong but that's what it looks like to me when you have 2 - 3 entries from the same location within 30 minutes all from accounts with just 1 post.
When we have the Xmas contest, the grand prize has rules like that, but the one-off prizes do not. You of all people should remember that. So this is not an oversight in our rules for this contest. While the main reason for contests is to reward existing members, it's of course nice to attract new members. Sure, some will never be seen from again, but if even just one sticks around, then it's worth it!