Question: So, in my Post-Apocalyptic world, there’s a city down in South Nevada known as Vegas. Unlike the rest of the majority of North America, Vegas was not hit by nuclear warheads in its near vicinity. But, over the last 100 years, society in the city has devolved considerably. 

Vegas lives in a state of near constant anarchy. The only government-like forces are the families, but they often cause more trouble than they stop, causing gang wars in the streets and political assassinations and such. Mostly, Vegas’s economy consists of prostitutes, gambling, and drugs. 

Back far west, in the region of New California, the USC (United States of California) has arisen, and now boasts a large army and strong government. But, like the Vegas of old, these inhabitants, especially the crime families, want tourists, mainly Californian tourists, to come to their city, as they bring valuable currency that can be used to buy more weapons and armaments. 

So, my question is, how can you market an anarchic city as a tourism spot to people (mainly people living in civilized government)?

Answer: 
**Vegas is beautiful.**

All that Road Warrior post apocalyptic wasteland Fallout stuff. Bah. It is like a stew that has pepper as its only spice. Nothing wrong with pepper but your fiction has plenty of that. 

Make New Vegas clean and beautiful; an oasis in the desert. The competing families are Mormon families, with family values and they all promote that as a reason Vegas is safe and fun for visitors. Just like people might trust a Jewish diamond shop because it is run by Jews, so people trust Mormon gambling and prostitution houses because of the reputation for tables that are fair and prostitutes that are clean. Some proselytizing goes on of course but the Mormons are good at it and keep that aspect of Vegas at a low volume. 

The blood and killing is an unpleasant cost of business, not personal and they do their best to clean up quick and keep collateral damage to a minimum.
While anarchy can be an impediment to tourism, it does not have to be if

a) Outside society possesses resources to protect themselves while visiting (i.e. the rich hire bodyguards they bring with them). If the nearby established government does not provide adequate internal security, this is likely the case.

b) Bodyguards are for hire within the city. Any tourist who is wealthy enough will hire one and those that don't will bring their own forms of protection. If someone is too stupid for either of these, then they likely get killed or robbed. This would not impact tourism because the thought is that those killed "had it coming."

c) There is something worth the danger to attract people. Being avoided by nukes, Vegas likely already has this quality. If it did not, the reputation of Vegas is such that people would come if prostitution, drugs, and gambling is still available. This is especially true if the nearby government outlaws or restricts any of these things. 

d) People can get to the city. This does not need to be caused by any of the families efforts, but can be from outside agencies.

Any of the families can promote one or more of these things to attract tourists, and if these things already exist, the city may have tourists without any effort on the families' part. 

However, a family could sabotage the tourism industry by targeting tourists and tourist bodyguards specifically.