What is the thinking with some providers holding off on some services until you see them for a second time, who falls for it and why do some Providers think that's a good practice?

experienced this. In fact, a few times I've experienced the opposite - ladies providing services (like DFK and BBBJ) that their profiles and reviews say they do not.

Women in this business are real life human beings, not automatons. Different clients can give them differing comfort levels. What they may do with client A on a certain day may not be what they do with client B on a different day. I have found that intimacy, along with menu options, tend to increase with follow up visits but that is just my small sample size of dates.

The best guarantee of getting the best experience is to be born handsome, same as with civie chicks.

And I have no problem with the practice there.  
Start with a relatively inexpensive M&G that includes a happy ending. Her screening is probably light, scheduling easy, and you get to evaluate your compatibility (she looks like her pics and is enthusiastic about her service). Then for what is likely a modest upcharge other services become available. If you're going to invest in an unknown (to you) this isn't a bad way to go.

I don’t like providers who hold back on the first meeting, to me that’s no difference then the providers who upsell, I have a saying: never again, I don’t know if I could trust her next time, so I don’t go back, it’s to many providers who don’t play that game, those are the ones I give repeat business to!

Agreed. A provider has one chance to impress me for me to become a repeat client, so they better bring their "A" game to the 1st date.

that is listed on her profile or in her web ad, it would not stop me from repeating.  Some providers consider certain services to be too intimate to do with a complete stranger, so they wait until the second meeting when you are "old friends."  I can usually tell from the social connection we have during the first visit if I'm going to repeat or not, regardless of what services I did, or didn't, receive.  There's more to these ladies than "who can take a pounding," so I don't mind investing a little time to see what they are comfortable with for me as an individual if we have a flirty connection.    

Wow. If you are  a stated GFE and you don't provide said services it's just YMMV ? I'll be sure to keep that in mind when I never book with that attitude.

in your pants is a wad of hundreds rather than your dick, it can overcome lack of handsome with a lot of the ladies. Lol

I was thinking the same thing - whip out that 12-inch wallet and she’ll think a gargoyle is handsome.

Arguably the greatest escort to ever hit this town (Dara) was an ultimate anal queen.  She wouldn’t do it with you the first time.  I respect that business plan.

An asian girl I once saw - who I liked a lot - told me that her services and prices are set by her agency. She'll provide a lot more if I contact her directly. I took her up on it and booked directly with her the next day.  

This is an illogical practice that some likely do do. As the saying goes, "You only get one chance to make a first impression", so if she holds back during the first meet-up thinking I'm going to come back, she is sadly mistaken. It's like going to a job interview and holding back from telling the interviewer some of your good qualities or not putting them all on your resume - thinking you're going to reveal them after you get hired; good luck on getting a call back.

She probably would want to get a look at how big a carrot the guy is dangling.