I found an interesting
website that claims to have compiled a database of provider pricing data covering a large number of cities in the US and the world. The data apparently comes from rates published on independent, agency, directories and advertising websites on the Internet for October 1 to December 31, 2007.
The website makes a point of stating that this data is
for entertainment purposes only. I would agree that you should be cautious in drawing hard and fast conclusions from the data. However, it does provide an indication of what the competitive market pricing might be in a particular geographic region. Individual pricing will still vary with personal factors set by the escort (eg. type of services offered).
Here is the chart for selected US cities:
And the chart for selected World cities: