I largely agree with kosh in his "the customer is always right" philosophy. The ladies are in a service industry and to get repeat clientele they have to make an outstanding first impression. And second. And third... Their service must be top notch to keep those "regular" clients. It's the nature of the business.
That said, I also get where you are coming from bballs.
Do we guys have a responsibility to our ladies? Absolutely - to be on time, have good hygiene, to respect personal and sexual boundaries, and generally try not to be a creepazoid. You know, the whole "upscale gentleman" thing. And personally (with regard to your question) I try to make sure my attitude is top notch too. I think going in with the vibe of "I'm going to have a great time no matter what happens" helps immensely. I think on this point you should meet the lady at least half way. Or at least if you want to have a great time. Which presumably you do. Otherwise you are about to waste a whole bunch of money.
I used to frequent comedy clubs when I was young and even tried some material at some open mics. I was always fascinated by the comic/crowd interaction. You got to see folks in the audience that have their arms crossed with a scowl on their face that you know are thinking "you better make me laugh funny man." Then there are others that are drinking and laughing, having a nice time, and open to being entertained. And it helped me when I was in the audience to try to be open to enjoyment. And yes, sometimes it just doesn't come... but being in that mindset always helped me to have a good time. Not to mention I am very empathetic now to anyone trying hard but bombing miserably.
The hobby is kind of like comedy. Well, some days more than others, lol. When I was a younger hobbiest I sometimes went in with my arms crossed (ok, figuratively speaking) thinking "this girl better impress me." But when I began to realize 1) sex is a team sport and 2) you'll have a much better time if you're both having fun - then things changed. My positive energy became contagious and I almost always I had a great time.
That's not to say you shouldn't have your standards and high expectations, but (to bballs comment) I think we should also carry in a positive attitude along with that donation envelope