So, that's why there are a lot of them and I can imagine how much the forum itself earns from itself to keep the cost of running and of course for the admins to keep themselves, have something in return. It's a long time forum as well so, it is understandable but it doesn't really look good with all of those paid banners and spaces.
I've seen forums like that but not casino related. So, it sucks to be one of those when you need a permission from the owner there and have an x deal.
Basically, the forum owners and staff earn every penny. The users get nothing from these forums because there are no signature campaigns. There might be some promotional offers and giveaways from the forum or the casinos, but that is all you can make from those forums, except for Altcoinstalks. Altcoinstalks adopted the mixers right after theymos banned them here!
I assume people don't care much about this forum. But when you look for an alternative, there is none. Even in most forums, you don't have freedom of speech. You cannot write whatever you want. This is what makes the Bitcointalk forum kind of unique.