This idea that a prossy can see x number of clients and therefore makes x number of £s per week and therefore so much per year is bollocks.
It's totally impossible to estimate how much someone earns.
For a start it's unreliable work. Okay there are lots of punters but equally there are lots of prossies. The competition in London must be intense. That is perhaps why so many are on so many different agency sites.
Some punters seem to naively think that all prossies sit by the phone all day waiting for it to ring. This isn't so and indeed many of them do have other jobs. Nor do many of them see multiple clients per day.
Amy, the one I've seem more than any other, has told me numerous times that she is very much part time and because of her other work hardly sees anyone. Indeed last time I tried to see her last May I missed her as she was late getting back from her other job and I was going home. The first time she's let me down in nine years. Although she could be lying about not seeing many clients she hasn't had a Prossynet report for years, despite having quite a few from around 2002 - 2007 (I first saw her in 2005). Even in the early days she told me she only needed 2/3 clients per week to pay her rent. She has always charged £200 per hour and said she would never reduce it as she believes she's worth that. From her viewpoint it's easier to see one client for £200 than two for £100 and I don't blame her in this respect.
I would imagine there are many more like her who do other work and see only a couple of clients per week. In my vast experience these are usually better than ones who are doing it everyday.
Nicoletta, on the other hand, the one I've seen second most (also £200) I have been told (not by her) does make a very good living indeed, and some months can make thousands. However she also does other things and has many extended breaks from it which help her to keep fresh and not to become jaded.
However going back to my original point I think it's a fruitless and wildly inaccurate exercise to try to estimate what a woman makes from the business, unless of course she tells you. And even this is very likely to be a lie!