looking at it only from the standpoint that once a guy gets there and finds she is something far short of a legend, he would not repeat, but as you say, if she's getting enough guys by mistake, she may not care that they're not repeating.  

A certain long-gone online resource dealt with the issue of multiple providers using the same name by (a) coming up with a shorthand designation for certain establishments and (a) identifying them by said establishments. The method in use for the establishments was to use the city and last 4 digits of the phone number for example, an establishment in San Jose with a phone number of (408) 555-1234 would be referred to as "SJ 1234" while one in Mountain View with a phone number of (650) 555-5678 would be referred to as "MV 5678", one in San Francisco with a number of (415) 555-9999 would be "SF 9999", and so on. If there were, say a Coco working at all 3 locations, then they would be differentiated as "Coco @ SJ 1234", "Coco @ MV 4578", "Coco @ SF 9999". If Coco in SJ moved to Santa Clara and changed her working name to Pepsi, it was simple enough to identify in reviews "Pepsi @ SC 4321, formerly Coco @ SJ 1234". It was a reasonable enough method that cleared up a lot of confusion...

I have been burned many times, especially in Las Vegas, when  bookers refuse to tell me where a girl has worked before or under what name, and then I end up seeing a girl for $300 that I already saw in LA for $250 under another name.  It really pisses me off when they know but won't tell you.  

 
Conversely, I had a booker recommend a new girl one time and I said I would wait for her to get some reviews, so he told me her former name in another city and she already had over one hundred TER reviews.  I booked immediately.