There is a membership fee that is paid when you use vbulletin as your webmaster. Included in that fee is the access to the texas hold em casino game and the rest of their arcade, and that's the only fee they pay.
I dont know how much it would cost to add texas hold em to the arcade, but I'd love to be on there too when the day comes that CG can pick it up. Having the live chat is a blast too!