I think it's just more simple to create an online casino based on blockchain, cause it gives more opportunities for your users.
I think the opportunities will comes to you because you can get more money if you can attract more visitor to come to your website.
But that is not easy because you need to make a promotion about your site so they can visit and try to be your member and they can deposit their money to start playing the games.
Blockchain could be the future of online casinos since blockchain gives a simple and fast transaction than the banks and the best is, blockchain doesn't need verification to make a transaction.