^ Well, since there's no signature campaign maybe you can do your own,,, take advantage of the situation that you will be the only one doing it;)
If you can be allowed to put your referral link in the signature that is. I actually have a lot of signups from my own. So it definitely works.
Mint Dice had their signature campaign running for certain time period. With that they had good visibility among the forum members. Very few go through the different announcement thread and find the best and make use of it. Often if there is some form of contest relative to the gambling site or logo, it'll give more traffic to the platform. Maybe among that little could get converted as revenue.
If in fact it was a great signature campaign, I am seeing that many sites that are entering the forum do so with a signature campaign, apparently many want to have many clients and traffic on their platforms, this speaks well of the sites because they know and understand that the business model is based on investment and through this type of marketing they do a better job because the users themselves give them the recommendations that they like the most, in fact one of the things that is most sought after is to reduce the KYC requirement.