These ladies are all independent businesswomen, and they are charging a rate that the market is willing to pay.  Vegas is a unique place.  It's a city of excess, where tourists like to come and splurge.  

Think about how much money guys piss away in Vegas at strip clubs, dance clubs, and gambling in the pits.   Very often way more than $600...and they probably have a lot less fun doing it.  

Free pussy is the most expensive pussy there is.  

You're also on tinder... if you're looking to get laid with a hottie for free you shouldn't be here...

Yes, you are right vegas is really expensive. But there is two reason why it's really expensive.

1) It's a famous tourist place and the place which is famous for tourist and adult fun for whole night then that place is obviously getting expensive.

2) Vegas has high quality good looking girls. The girls in Vegas are mostly not "girls next door neighbour type" they are good looking beauties that can give you pleasure you'll never forget.

I'm not a guy sleeping with many girls so I don't know much but I've seen some beautiful girls and pornstars making entries on Spearmint Rhino strip club.

I've added a link it shows of spearmint rhino strip club too and maybe you get excited to visit that club.