I was chatting to one EE girl right before she retired, she reckoned she had £0.5M in about 2.5 years.
She said that when she started she was hardly getting any bookings, and struggled to get her rent and didnt eat some days for the first 6 months, but she was very inteligent and a very good actress, so soon had the AW ratings climbing. She basically never left her flat, hardly owned any clothes, no car, only holidays back to Romania with the cash, didn't waste any money, she had a master plan to build a lump then invest it in a business in Romania.
A few of her regulars were visiting for 3-4h at a time, sometimes 2-3 times a week each, her hours were 9am to 10pm, and there were always a bit of working out of a suitable time as she had so many advance bookings when you called, so absolutely no reason to doubt her earnings
Think she was also a bit of a nympho as she always made sure she would cum, I remember 1h I had with her she came 4 times
She is the only WG I have met who has the business brain as well as the steady stream of punters, usually its airheaded girls with fake nails and wasting the cash on lifestyles, or more down to earth WGs who just don't have the same footfall in the door