There are already so many casino's here on the site. we want a sportsbook as well, not only casino's. but okay, a casino appears to be much more easy to start than a sportsbook for gambling.
hopefully you will find some players, the fact that it is only a casino and no betting on sports is a negative point.
This is just bad, the OP is promoting his casino hence we must not insist on something that they didn't want. Would you tell a starting business, example like a lemonade stand, that lemonade is so cliche so we want some burgers? But I get your thought, duelbits is a casino but they can also upgrade soon to add the feature you want. And also, there are differences when you would start a gambling platform, when it would be a casino type or does it feature a sports betting. Both are easy to start when you would focus on only one of it. Would you tell those sportsbook websites to offer slots and dice upon the release of their platform?
I guess the suggestion is good but since this is the is new then maybe best to focus on the current game which I think not bad, building a reputation is a must since maybe it's a bad decision to rush things up and marketing campaign exist now and building a community is the main focus before this addition really happen. If more people will demand about the sports book for sure it will be added on future.