I tried it two years ago -
You can't get somebody that is still in the process of looking for porn and ready to jerk off to change gears and start gambling and playing games...
that said... there might be room ... on an exit pop to throw an ad. Presuming the surfer has jerked off ... they now might be ready to go do something else... like play a game.
Another place to do some Casino advertising is with a small non obnoxious link on your pages... to a casino. Your bookmarkers will know that they can get to a casino through your site...and come to you as a trusted and reliable source.
~brett
www.dormangels.com