and I think a lot of it also has to do with how often a guy actually sees providers.
I think some guys are like the 16 yr old virgin who expects something purely physical to be "life changing" and sorry folks, what we do here is simply FUCKING, it's not supposed to be life changing, at best it's supposed to be "fun" and at worst I it shouldn't be anything more than a waste of a few hours of our time and a few hundred dollars of our money, hardly anything worth losing sleep over.
Let's put it this way, if you order a pizza, and ordering a pizza is something you only treat yourself to once every two months, getting anchovies on it by accident is going to ruin your "pizza experience" for two months. OTOH, if ordering a pizza is something you do whenever you have the urge like a normal person, getting a bad pizza won't even ruin your night, as you'll simply order another one from a restaurant you know will deliver. I think seeing providers is much the same. Pizza is not a life changing experience, neither is seeing a hooker, all I really want is one that is delivered on time and is hot and delicious. If one restaurant doesn't deliver as promised, there are plenty more to choose from. lol
The first is that it seems to me lower-volume mongers are perpetually dissatisfied. Many agonize for weeks on how they're going to spend their $400 this month, and when the girl they eventually pick is not a perfect fit for them, they bash her and act like they were "cheated." They still got to fuck a pro, so what if its NOT perfect?
Next is expectation management, as you call it. P4P is a business with ADVERTISING. MOST, if not all products and services use exaggeration in their advertising. From what I see in reviews and read and on the boards, the biggest complaints from mongers is the girl was not "as advertised". Most complaints involve weight and age, so I follow the rule of 10's. I add 10 years to her age and 10-20 pounds to whatever the ad says. That sets my level of expectation, and I'm therefore seldom disappointed. If the girl IS as advertised, then its a pleasant surprise.
My mongering is probably only 25-33% of yours but I have managed to avoid disappointing encounters once I learned the game.
I don't think volume is much of a factor.
I agree with your "expectation management." He never mentioned price but if he only spends 200 bucks, he won't be getting great experiences. If he is spending 8-1200+ per encounter he will be more disappointed since the girls will be no younger , prettier or better in bed than the 3-500 "going rate" priced girls. Too high in price is just as bad as too low.
He has to think like this: if he sees 100 girls perhaps 85 will be a real world "6." Cute and fuckable but not spectacular. Perhaps 12 will be a "7" . Only 3 out of a hundred will be a really hot "8."
There will be no model quality 9 or 10's. They don't exist in American " hookerland." Once he finds the proper selection process, he will be fine as long as he accepts the above.
There is also the porn factor. People who live on a constant diet of porn reportedly have trouble in the bedroom because porn is so intense that real life doesn't measure up.
" Might be seeing the ad and creating an unrealistic expectation"...
I've had that happen, probably other times that I'm not aware of because I've never been told outright....until recently, at least I think that was what was happening in my situation....
I got a random text from a number not previously in my contacts, but the content of the text clearly indicated it was someone who had spent time with me because of some intimate details that one would only know by meeting with me were mentioned. I was mortified by this because it felt like a direct assault on me, my character as a person having met me, again based on certain details provided, which made it personal vs some random person, never met, who hides behind their handle, screen, and keyboard hurling insults. This person literally made me aware of my short....rather, where I fell short of his expectations.
It took me all of 15 mins to absorb, process, and respond/react.... I identified the person behind the text by recognizing the area code of the # the unknown texter was using and it was a gentleman I had seen probably 5 days prior....who kept my company for 2 1/2 hours and not one word expressing any issues or concerns during the whole time and left with smile, a "thank you, I had a wonderful time", as he walked out the door.. not run, but walked! Once I realized that last bit...then I really started to pay attention to what his gripes were and you know what...his focus was all surface stuff...none of which had anything to do with me as a person.....
I bet you're all curious to know what some of those intimate details were and how he arrived at what he did? Well first off his opening line sunk me from the beginning with "well I am thoroughly disgusted with my experience with you".. I was "tons" older than the pics in my ad.....65+. I have no financial skills which is why I do what I do and drive a 15 year old car (make & mode). He parked behind it... He figured as I projected an upscale attitude on my site, I would at least have a decent car. He was 8 years off.
I like to sing ... I'm one of those that sings in the shower...do karaoke now and then, and known to bust out when certain words are said in casual conversation that sound like the lyrics to a song I know...watch too many musicals maybe....and I'm sure I did during our visit and his comment.."Horrible-please don't pursue that". As for how I look...hmmm....didn't he already say I look tons older? The focus this time had to do with some body hair around my nipples! And what the heck am I going to do when I can't do this line of work anymore ... OR...my stupid bodybuilding competitions.? Maybe time to think about a real job rather than this as an occupation and paying zero taxes because again, I have no financial skills. I think he totally forgot the part where I explained to him how my "other" job as a certified personal trainer was real convenient in camouflaging my part-time gig as a masseuse, a companion, and whatever I want to be....since I work out of .. and i showed him the garage that I had renovated years ago and it's totally equipped out (it has been real handy these last couple of months)...again no financial skills?
My knee jerk reaction initially , I was hurt then it turned into anger...Anger made me want to and I WAS going to rip him..but remember me mentioning those 15 min it took to absorb, process, and then respond? When I started looking at this analytically, especially when I looked at what he chose as his focus points by which to "measure" me, allowed me to take a step back and remove me out of the equation because it was really about my car, my singing, my financial skills...which had nothing to do with me as to the kind of person I am,.... then could I see it more objectively and then it no longer was personal. My response.... I sent back a text saying...I'm sorry you feel that way.........Jason" .. but I was still confused as to how/why he was disappointed in the first place.
So I took it to one of my great guys and shared. It's his opinion that through my ad and my website...thinking back on certain key words in his text, that this person had created an unrealistic image of me in his mind and so when meeting me, it was a disappointed to him to find out that I'm just a normal, polite, down to earth, mature (sexy) woman.... (and I have no shame).. 
It makes sense to me. Anyone into pop psychology? Was he close?
