These must be the 'guests' that 'go dark after 2-3 years', according to the article.
Churn must be interesting for casinos, there has to be a continual search for new 'guests' that haven't already been fully fleeced. The out of this world hospitality is probably the best advertising they have.
Although gambling is as old as money and can be found all over the world, the phenomenon of Las Vegas is extremely American. In the rest of the world there is 'pecking order' with a hierarchy where everyone knows their place, whether they like it or not. This is useful as there is no pressure to 'become king' as that position is not open to you. You can be relatively happy with your status even if you are 'just' a school dinner lady. Furthermore you can gamble on a regular basis to improve your situation (in your dreams). There are the 'turf accountants' on the High Street or at the actual races. Sports betting also allows for the gambling interest to be masked, you can pretend that you 'love' horses, football or dogs.
Meanwhile, in the land of the free, where the dollar is king, there is some pressure to show you have made it, that you are eligible for the top table. With this pressure comes status anxiety, so you 'have' to make it or die trying. Since you can't just pop in to the 'turf accountant' to waste some money on horses (America lacks bookies), you have to save up and go to Vegas, to live it up whilst you are there. Interesting 'monopoly' Vegas has going on there.