Reviews are a catch-22. On one hand...its good for hobbyist to have some assurance that they are not walking into a bait and switch, or worse.
However, for some pvdrs, having detailed accounts of something so intimate recorded on the Internet; it makes you more vulnerable on so many levels. And the rating system can become an obsession where a pvdr feels she must compromise her comfort level to increase her business. I personally started in this "business" in Europe, where Courtesans and companionship for a certain caliber of clientele is done through personal introductions, and strictly word of mouth. The women are highly screened, and their background, education, looks, manners are all vetted to gain access. It was based more on compatibility and long-term arrangements. Also, the men were able to get exactly what they wanted and were rarely disappointed because they were able to go through one trusted individual and say I want "x,y,z". It was more elegant and fluid for all parties. Returning to the states, I initially detested having reviews published; particularly with the emphasis on "the dirty details", rather than the general experience of her companionship.
Perhaps the history and tradition of courtesans (who often were bestowed with land, wealth, political power, and were well respected by high sociesy) that has existed in Europe for centuries allows for it to continue.
American culture evolved as a rejection of monarchy and society, thus, the moral climate is vastly different. Ads, reviews, marketing, ect. form the context of the modern courtesan. Point being...a pvdr is entitled to choose every aspect of her business and how she runs it. Including not having reviews.