10 posts per week must be in the gambling section.
I think minimum 10 post on gambling would just encourage spam. I have seen other managers asked minimum 5 post on gambling section and I believe its appropriate. Because all applicants isn't gambler so in order to fulfil requirements they might make spam post. I am not saying about all participants, there is also few good poster who will able to make 10 post. But I think you could reconsider about this part.
It's just friendly suggestion, nothing personal.
Good luck with your campaign.