As long as gamblers are ever commited to a particular casino without changing to another then i think it something worth deserving also if they can have access to enjoying every good that comes in through their loyalty to that casino, but when one side is vested against the other makes it difficult to control and justify the means to weather they were been served right or not, also we have most of this casinos as well that feels relented because they think they have already arrived after making a number of committed gamblers to their casinos, shouldn't they be more concerned about gamblers being their pride and do all it takes to always have their good support at any given time on what they can deliver.
I think that of course any serious large and proven casino has such players for a long time, you can probably call them fans. And like football clubs, they are interested in some kind of even a small support of the fan movement. Likewise, the casino should take care and somehow contribute to the preservation of such players as fans. Of course, these should be some kind of preferences, bonuses and similar things.
I think keeping the fans of the casino alive is just a serious and important task for the marketing service of this casino.