I've never been to Las Vegas but I love it in concept because it sounds so made up. Imagine if you were reading a fantasy novel and they were like "smack in the middle of a deadly inhospitable desert there is a glittering city of indulgence and lawlessness and cheap sin that has specifically engineered itself to obfuscate your sense of time and keep you there as long as possible while they take all your valuables." You'd be like yeah that's some wizard shit.
Add to that the fact that it was originally engineered by organized crime to ensnare workers who were working on the water-source that made living there possible
If that was in a novel, you'd go "now the author is going a little heavy on the dystopian capitalism narrative, isn't he? Who would do something so stupid and get away with it in real life?"
One time, I was trying to think of a fun way to have a Las Vegas style location in a D&D campaign, so I googled Las Vegas D&D and found a thread where someone in Vegas wanted to run a module. The thread was titled "Curse of Strahd in Las Vegas", and that sent my mind to some interesting places.
You know just how far away from The Law that place was when the mob got its' claws on it? That's also the land where polygamy remained a standard practice until relatively recently.
Check out the 1994 “The Stand” miniseries or read the book by Stephen King. It explores the idea of the main bad guys and their leader, who is essentially the devil, taking up residence in Las Vegas.
Sadly no, I haven't gotten that far yet. What I've got SO FAR is Castravolva is like the Rick from Rick and Morty, in the sense he is a genius, almost unstoppable asshole. As far as the actual city, I havn'treally touched it yet, I just have a basic concept of what it is. I WILL SAY however that it was inspired by my recent newly discovered love of Hockey and the knowledge that Las Vegas team is known as the GOLDEN KNIGHTS! (I may be incorrect on that, I am a mental case). Anyway, i havnt come up with any fantasy slot machines, but I am working up a tabletop ruleset for high fantasy hockey!