Good question, as usual, Goldie!
I'm interpreting the question as why would I not want to see someone a first time, as opposed to a return visit.
For me, it is complicated, involving a number of tradeoffs and evaluating imperfect information. Some very positive traits can offset some minor negative ones. Here's part of my thought process:
Price is always relevant. Too low might scare me away. Too high can be financially prohibitive or make me wonder if there are equally good (or nearly so) options for less. However, I have stretched a few times when I was fairly certain that it was worth double my norm.
Facial features, if discernible, matter a lot to me. I'm a relative newbie, but just like a normal date, I like a pretty face. There are lots of providers that most guys find attractive but don't appeal to me. It's in the eye of the beholder and consistent with my tastes, as narrow or quirky as they may be.
Physical build must be less than 20 pounds above the ideal weight. I don't require a hardbody, but trim is sexy to me. A gut is not. I prefer medium breast size--B to DD. There is such a thing as too large, in my view.
I prefer no/few tattoos or tasteful ones.
I prefer nonsmoking or no smell/taste of cigarettes.
Attire matters. I'm old school. Platform shoes are a negative for me. Standard pumps, sandals, or bare feet are great. Classy lingerie, bikinis, or dresses are turnons.
Reviews are key, which is why I because a VIP. It's all about making good, informed decisions. Generally, close to 8/8 is my floor. But the details matter. I try to read lots of reviews and read them carefully. Recommendations and repeat clients are good things.
Any signs of going through the motions, being too interested in money, rushing clients, are probably going to weigh heavily in the negative. On the other hand, someone who is a sweetheart, goes the extra mile, maybe runs over time-wise will get bonus points and strong consideration.
Some providers' websites seem a little heavy-handed and rules oriented. I understand the need to make thing clear and screen out the jerks, but a welcoming site beats a litany of rules.
Services matter, but again there is flexibility. I prefer BBBJ and CIM, but great looks or a sweet personality will cause me to consider CBJ, for example. If anal is available for a reasonable price (either base or charge), that can be a plus.
I notice almost all cases of typos and poor grammar, but I don't weigh those heavily, and often not at all. I'm looking fort other types of skills.
On the other hand, a provider with ratings well above 9 and rates above $500 should have an impeccable website. Proofreading and editing can be useful.
Goldie, feel free to follow up via PM. I hope this helps. I admit that my tastes may be a little quirky.