How did you come out with that figure?, and have you tried advertising on these channels for all I know Casinos go for a platform that converts like this forum and they concentrate on affiliate marketing, it's more cost-effective even the top casinos in the industry pick platforms that convert and get more leads, this is where casinos maintain their marketing, they create an announcement here, maintain a representative and launch signature campaigns.
Casinos will just waste their money if they are going to experience so they prefer platforms that have to give them more leads and conversion.