A higher price is never a guarantee of a "better" product. A product can be priced higher for any number of reasons, which may or may not include overall quality. Don't book a more expensive girl expecting her to be better; book her because you want to see her. It's going to be as hit or miss with a $200 girl as it is with a $180 or $160 or $140 girl. You can't buy chemistry.
I've seen eight of their girls in the past year (Sabrina, Jessy, Lindsay, Karera, Diamond, Candice, Becky, and Dolce), only one of whom was at $200. In this particular case, the girl was worth the extra $20 because she excelled in all categories (looks, service, and personality). Most SPs usually come-up short in one of these areas.