And for OP, if you can't find any potential buyer here. You can just post this on a website like flippa.com where businesses and domains are for sale and they're known for that.
There are too many operating businesses there that are up for sale and aside from the forum, that's one of the best place where you'll put this sale thread.
That is right, you may start thinking why OP sells his gambling casino if it is a profitable business. Op can run this to gain profit in the future and not sell it to anyone. However, I did not know if the price is worth it if you really want to buy a casino, $1.5m is enough to start your own gambling casino and sure that amount sustains even if you have ads. So good luck to OP, I want to hear if there is someone who are willing to buy.
Selling a casino has to have many reasons, the main one is that they do not have a lot of capital to survive, for a casino to get ahead what they must count on is enough money to support all the possible losses that it may cause, the other thing that It could be that the person who owns the casino already has his life well insured so that he does not want to have more commitment or continue to lead a business that is very profitable, if I think about it in a bad way it is because something went wrong and they want to get out anyway, there are things that are difficult to understand, but I would not buy a casino like that, I would have to have the whole truth to be able to have an idea of why he no longer wants it.