Yes you are right. The better the casino interface. The more users will be addicted to that casino, the better the quality of that casino will be. Gamblers will stay there longer. People will become more addicted to it. The more attractive the casino site is, the more the gamblers will be attracted to it.People will pay more attention to the fact that Ui Jeter will be beautiful. People will pay more attention to the casino that feels good. So the better the interface of the casino, the more addicted people will be.
Addiction comes from our mind, from our feeling, it has nothing to do with the UI or everything you can see and find in the casino.
Even if the casino looks very simple, provide so less feature compared to other casino, some will stilll be addicted if they cant control themselves.
When you are saying that great UI lead into addiction, means that you are blaming the casino to have great UI but in fact the one should be blamed is the gambler when he/she is getting addicted.
Gamblers should be responsible for themselves, addiction is their own mistake, not other's.