bitcointalk signature camapign is in a way a quality assurance mark
Signature campaign is one of the most effective ways to run promotions for casinos, but such campaign should be managed well by good managers. By hiring good managers to do this task, the BitStakes team can be guarenteed that post quality of participants will be high, and such high quality (or acceptable quality) posts will better catch more attentions from forum members. When they pay more atention to read posts, they will pay more attention on signature of BitStakes. Finally, they might visit to BitStakes, and discover it. It's a good start from well-managed campaigns. For good managers, you can find there:
Overview of Bounty ManagersWell it seem's that they no longer need one since they already abandoned the site and let it die.
They could have done some advertisement before and it could have help them to gain gamblers.
But looking at their thread and the games that they mention I think old gamblers would just stick to the site that they are already using,
Unless they would do something that would attract gamblers and try to play at their site.