I believe that no one will use the casino token if no one is playing on the casino. If they want to make their token exist for a long time, They should improve their casino to stay on par or at the level of those big casino. If their casino grows, The token will grow as well since it is one of the most accepted token in their platform. I can compared casino tokens to binance BNB, BNB really bloomed last bull market because on how successful Binance is and how good they marketed the token. I think that they should put extra effort and other utility just like BNB to grow big. It's hard to judge casino tokens but I don't think it will be easy on them.
A casino if you want to create and use their original tokens as a tool for betting or playing seems to be very difficult to develop and indeed as you said it takes a very long time and is a waste of time for the team that manages it. But here, from your opinion, which equates to the Binance BNB token, I disagree because there are many differences and in terms of usability and promotion, they cannot be equated because gambling tokens can only be used to play or bet on the gambling platform which has the token, while BNB can be used on various crypto buying and selling platforms and has the advantage of being an investment or trading tool.
Yep, As of now there are a very limited use of casino tokens but maybe soon they will add new utilities to it for it to be alluring and more effective to the market. On the early phase of Binance token BNB, They also have a limited utilities. As far as I remember, Binance is doing hard core promotions on their token BNB. They are offering trading fee discount if you use BNB on their futures trade. I don't know if they are still doing it but I remember that they are promoting it hard and the utility of BNB that time is not that much compared what we have today. There could be few utilities for casino token like using it to be a VIP on a casino, have a priority customer support or having an exclusive promotion to those who have the casino coin. We don't know yet but I believe that it would be hard for those casino to implement things right.