Many men, myself included, are very visual minded. A provider has to have a certain look that appeals to my taste. It really has little to do with what is considered "beautiful" by the masses.
It is difficult to describe, sort of one of those "you know it when you see it" things.
My ATF has this "look", (and the skills to go with it), and that is why I continue to see Her on a regular basis.
I read reviews where Hobbyist have a great time, decribe the Lady as breath taking, and she has little appeal to me at all.
Sure, we all recognize that there is an "industry standard" for beauty that the majority of Men accept. But, that does not mean we would spend time BCD with that version of what is considered beautiful.
A good example is a well known touring Lady, a Porn Star, that is known for her huge back side. While other Guys drool all over this, it simply looks gross to me.
We are fortunate to have a wide pool of great Providers, tall, short, skinny, fat, black, white, and all things in between, that will appeal to any Hobbyist's taste.