Correct. So many of the gents who get scammed are looking on Listcrawler, Eros, and Mojo. If they would stick to ladies with long review histories here on TER it would be easy to avoid the scammers.

Thanks Daltonfury for the mention.
I will preface this response by saying many yrs ago before TER I used to work for agencies.
i will share here how it works and how not to be scammed in Vegas.
If you see an ad and the provider shows up and immediately asked for more $ than what is advertised.  
This is an Agency gal not an Independent. The "fee" you pay to those type of ladies all goes to the agency.
It is supposed to get you a nude striptease and secure your time UP TO THE HOUR. The key word UP TO is used when speaking to these agencies that are posing as independents. Since the fee she collected "to get her to your door" goes to the agency. The girl makes nothing. She works on "tips" which means in order for her to do anything she has to be paid. The phonegirl does not quote anything additional rates to customers that is up to the lady who shows up everyone's rate is different.
That is why the rates quoted after the fee is paid is significantly higher. And that is how the Upsell begins.

The lady who answered the phone or email isthe phonegirl who gets a percentage of the tip.
If you do not tip the lady leaves. But most guys end up spending way more $ than if he just looked here for reviews or a similar site. There is a popular site used for advertising where  are many asian outcall ads advertising low rate 200+ for massage tip be prepared to spend way over $600 and no GFE a clockwatcher,charges for more $ for another round etc
It is an agency not independent and somehow a few of them have P411 profiles.

If the rates are too low in the ads beware. No social media presence and website do not waste your time.
Do google images reverse on the pics . See if  they are not stolen from somebody else.
Had client recently share with me despite knowing about TER he contacted one of those ads girl came over for a 200+ massage. 1k later on top of the fee he got a very mediocre session and was so disappointed,

Stick with well reviewed or a long online history. Google her contact info see if multiple ads come up
Just my .02
Be safe guys