No doubt many successful casinos in Bitcointalk because they can running the campaign very well. I agree that casinos need to find which promotion that will runs good for them. But signature campaign is the most campaign that many casinos use to attract people attention.
A well run campaign can generate good results for the platform because as long as the campaign runs smoothly, many members of the forum will be interested and they end up doing their part really effectively.
We can see the results of that on this casino, I have come across a lot of the ads here in the forum, and first time I visited the rainbet casino was through the signature of their participants and I can say that their .site load pretty well and smooth, I have no doubt in the casino capacity to handle their growing community.
I want to believe that by "casino capacity" you meant the management of the casino since a casino itself can not handle a community, it's own community..
Signature campaign and it's effectiveness in making a casino popular can not be under-estimated, most especially if like I've said before, the management of the casino decides to embark on a long term campaign, at first and at the beginning, it might feel like the ad campaign is not effective as no new people are joining the casino, but all this usually change with time..
And one thing I love about advertising on this forum is that ads are not only for the users of the forum, visitors as well can see the ads and decide to patronize the casino if he or she is a gambler.
I also have come across and joined many platforms which includes casinos, different types of projects through their signature ad campaign on this forum.