Going back to the original reason for this discussion, it was all about the quality available at a reasonable price point.
From my own point of view, I don't punt very often, maybe twice a month max. Across a year this will be a mix of girls I have seen before and new ones. The repeats are girls who I have both got on well with and provide a good service, some of whom are not on AW any more but are happy for me to get in touch and arrange a meet.
The vast majority of girls I meet are at least over 30 and some a lot more than that, but maybe not as old as me. I never pay more than £120 per hour and often don't pay that. If I ever do fancy a girl who is more expensive I will just book a half-hour, and if they boot me out on the stroke of 30 mins then it's unlikely I will see them again. I never see girls who are more than a size 12 - this is my preference shape-wise.
So the point I make is that there is a good pool of girls available at a reasonable price point, but sometimes you have to put in the legwork to find them. Maybe not set your standards too high - let's face it, if you want a page 3 porn star then you are going to have to pay for the experience.
With regard to the new ones, I do all my research on here and AW. If they don't have a number then I just email them, set my stall out and see what sort of reply I get. Even if they do have a number, I may email them first. I rarely do short-notice punts. If I'm feeling particularly horny then I will contact someone I've seen before.
Sorry I'll stop rambling...