Yes there is no guarantee of success with signature campaign. Signature campaign any other advertisement wont be a successful marketing strategy if there is no attractive offer in the casino. As a product, there should be selling points that make people who read/see the advertisement can be attracted to come and play. There were some casinos with signature campaign in the past but they failed to survive because the lack of attractive offers in the casino. All in all, advertisement should be followed by attractive offers in order to be a marketing strategy.
For good advertisement - one need a good budget too.
The more money you put in the more reach you will get for the business and also after tapping the potential customers - it is hard thing to maintain the client - so the real game starts then.