Hi, what is he minimum betting amount in your platform ?
10 satoshi as per OP post
https://bitcointalk.org/index.php?topic=5126117.msg50542180#msg50542180This is very good to know. I also want to believe that it(campaign) brings quality users in the long run. Otherwise, I highly doubt that it's only for branding and quality mark.
veleten gives you a good point already. Another addition is that you should not rely on signature campaign only as it wont be effective for you.
Signature campaign may brings quality users as well as it may bring you nothing.
As I read, you are doing a test campaign for one week only. To be honest, a one week campaign is not enough to see the result or the effectiveness of a campaign especially if you have no other offers on the site.