pimp, co-op, booker, agency...  Or a girl who uses multiple names so her poor performance does not follow her.   The most important thing is to check her profile here on TER, her ad links, web site, and full reviews.  Yes, when you get to that point, you NEED VIP.  Google just does not replace proper research.
A good provider knows her reputation for quality services is valueable...  
skb

the scenario you described here in Vegas would most likely be an agency posing as Independent.Multiple ads with different pics being used but same number=agency.I would recommend getting VIP here if you do not already have it and doing your research.I know you said you did google search the info but search the contact info to see if the lady in question has any reviews here.Now,you said the ad has disappeared completely very strange indeed.I do not think you were paranoid that is totally different than be cautious which is what you are being.
Good luck to you.

to stay away from BP.I do not advertise there but there are reputable ladies that do advertise there.It is not the site where you find the ladies ads it is the research that you do after that.As long as you do your research wherever you find a lady you will not have an issue.

I add ones of interest to my "Favorites" list (must be VIP to use this).   I just find it's easier to shop here than to shop an ad site and then bring the data here to research.  If a girl is starting out, sooner or later, she'll get reviewed here if she's any good.   (Or if she has a scam...  a warning!)
skb

Without good reviews to back her up, you are taking a chance if you decide to see her that things won't go as you hope.  Further, the scenario you described has been brought up here before many times, often in a negative light.

The standard advice of seeing only well reviewed and regarded ladies that are attractive to you after doing your homework applies as always.