Dear Confused,
btdcasino.com is an affiliate of bethedealer.com. Bethedealer.com gives affiliates the ability to create their own site, domain name and all, and market the casino as they see fit.
Here are a few more:
www.BTDCasino.com
PlayAndDeal.com
www.TheVegasGrand.com
www.Cybercasino.ms
www.Play2Deal.com
www.Casino1.co.il
So instead of merely slapping up a banner ad or link, an affiliate can create their own "themed" site and take it to the market place. The software is the same, the support and payment process is as well. What is different is how you (the player) arrive at their door.