Why wait for a new one? when there are several existing ones who's been here for a couple of so years which also has good reputation and standing in the forum as well as reviews from outside the forum. Casinos who has been consistent in their promotions means they have enough budget to develop their casino and giving bonuses to their clients. New casinos is in no guarantee they'll have a development in the future just like how you want them to be.
Well, that's your choice anyway. IMO, I'd rather play in a known and developed online casino already as they can offer you bunch of freebies and stuff like these if you want to get one of them. There's not much like these stuff on a newer casino for sure.
Some people want to try to get a new experience at a new casino so while waiting for the new casino to be released on this forum, they can continue gambling at their usual casino. New casinos who want to expand their business and find this forum will use it as a place to promote their site. Those new casinos will see that this forum can help them to get a lot of users.
Every casino will prepare a certain amount of funds for promotion. That will help them to immediately prepare everything so they can immediately promote their casino. When they can evaluate the interim results they get, they will see how far they have gone in their promotion.
I also like gambling at online casinos because I can gamble wherever I want. You are right that online casinos often provide promotions and freebies to their members. That's what makes more people want to try gambling at online casinos.
The forum can be a factor in helping gamblers find a place to stay and have time and pleasure gambling. But we don't feel confident that it was totally safe because many sites are good in their early days but eventually change after getting more users/gamblers. Still, we need to be cautious and just gamble when done doing the research for at least we are sure enough that it works well. But as to remind ourselves, scams can be possible to happen anytime which is why we don't have to keep our money in them for a long period.
By doing research and following the casino's developments from their ANN, we can find out if something has changed or if there are updates. We also know how they serve their members. Besides that, we can find out if one day the casino will change or grow even bigger.
With that research, we can start to know if the casino is turning out to be a scam. If that happens, we can immediately move before something bad happens to us. We wouldn't still be in that casino if some things couldn't be handled well.