Why moderated thread? It is always fishy to see a new site create an announcement thread with moderated mode.
Talking about your site and game, it is simple lottery site but I can see something new here which is additional jackpot for the monthly draw.
About the prize distribution, how if there are only 2 participants for the 15 minutes draw or other draw? Will be returned to the players when there are only 2 participants or winner will take all the prize?
Anyway, the ticket price is too expensive for starting phase of your site. It will be much more better if you have several lotteries with different ticket's price instead of fixed price for all lotteries.