It is true and I also agree that customers are number one really important in all types of casino gambling online, because this is how casinos survive, if there are no players there is no profit coming in which will result in the closure of the casino.
But there are also other gamblers who are very unaware of the rules of the casino and do not know whether the online casino is regulated or not, which they should also know.
Of course In every casino their Major priorities are their Gamblers I mean their customers and they must treat them rightly, when there is no gambler on the site then it means no business for them.
So as gambling site they have to be dedicated to their gamblers and people who are regularly visiting their casinos, and of course before any gambler goes into gambling site to gamble they should at least read their terms and regulations to know how the casino are being operated before entering there to gamble.