That's a lot of ads, over 70 pages. I would be very careful, there's some legit ladies there, and a ton of scams most likely since it's Vegas. I would check US review boards and find ladies with a track record, or those who also have ads on other established sites as well. Private Delights, ECCIE, other boards, use your big head, not the little one. If you are going to do outcall to your hotel, meet her in the lobby first and walk if you catch a bad vibe. Sounds like you have done your reading here and that's a good start.