I guess there is a difference between professional career working girls and short term dabblers.
Dabblers don't really care about clients. They advertise, take whatever money comes their way and rely on a big pool of potential punters to keep in business for a few years, then they fade away.
Professionals understand about building a regular income (return client base) and will be very professional in their booking, hygiene, appearance and service.
One reason why I tend to avoid pretty little 18 yr old 'pop ups' and stick with slightly older ladies who have been around for a while and know what they are doing.
How do I find them ? Search the websites,
Experience is everything.